Upstream ios/showcase source code.

This is a dev-only, standalone app for Chrome for iOS development. It showcases
(and is restricted to) UI elements used and developed for Chrome for iOS.

BUG=653086
R=sdefresne@chromium.org

Review-Url: https://codereview.chromium.org/2592593003
Cr-Commit-Position: refs/heads/master@{#439773}

ios/BUILD.gn

@@ -29,13 +29,14 @@ group("all") {
       # List all the targets that need to be build on iOS by default.
       "//ios/chrome/app:chrome",
       "//ios/chrome/app:chrome_clean_skeleton",
+      "//ios/showcase",
       "//ios/web/shell:ios_web_shell",
 
       # List all the test targets that need to be build on iOS by default.
       "//ios/chrome/test:all_tests",
       "//ios/chrome/test/earl_grey:all_tests",
       "//ios/net:all_tests",
-      "//ios/showcase/test:all_tests",
+      "//ios/showcase:all_tests",
       "//ios/testing:all_tests",
       "//ios/web:all_tests",
       "//ios/web/shell/test:all_tests",

ios/showcase/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/ios/rules.gni")
+import("//ios/build/chrome_build.gni")
+import("//ios/build/config.gni")
+import("//ios/third_party/earl_grey/ios_eg_test.gni")
+
+ios_app_bundle("showcase") {
+  info_plist = "core/Info.plist"
+  extra_substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
+  output_name = "Showcase"
+  deps = [
+    ":features",
+    "//ios/showcase/core:main",
+
+    # All shared libraries must have the sanitizer deps to properly link in
+    # asan mode (this target will be empty in other cases).
+    "//build/config/sanitizers:deps",
+  ]
+  bundle_deps = [ ":launchscreen_storyboard" ]
+  assert_no_deps = ios_assert_no_deps
+}
+
+group("features") {
+  deps = [
+    "//ios/chrome/browser/ui/tools:tools_ui",
+    "//ios/showcase/settings",
+    "//ios/showcase/tab_grid",
+    "//ios/showcase/uikit_table_view_cell",
+  ]
+}
+
+group("all_tests") {
+  testonly = true
+  deps = [
+    ":ios_showcase_egtests",
+  ]
+}
+
+ios_eg_test("ios_showcase_egtests") {
+  info_plist = "core/Info.plist"
+  extra_substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
+  deps = [
+    ":features",
+    "//ios/showcase/core:main",
+
+    # Add all eg_tests targets below.
+    "//ios/showcase/core:eg_tests",
+    "//ios/showcase/tab_grid:eg_tests",
+
+    # All shared libraries must have the sanitizer deps to properly link in
+    # asan mode (this target will be empty in other cases).
+    "//build/config/sanitizers:deps",
+  ]
+  bundle_deps = [ ":launchscreen_storyboard" ]
+  assert_no_deps = ios_assert_no_deps
+}
+
+bundle_data_ib_file("launchscreen_storyboard") {
+  source = "core/LaunchScreen.storyboard"
+}

ios/showcase/DEPS

+include_rules = [
+  "+ios/chrome",
+]

ios/showcase/OWNERS

+lpromero@chromium.org

ios/showcase/common/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("common") {
+  sources = [
+    "coordinator.h",
+  ]
+  libs = [ "Foundation.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}

ios/showcase/common/coordinator.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_COMMON_COORDINATOR_H_
+#define IOS_SHOWCASE_COMMON_COORDINATOR_H_
+
+#import <Foundation/Foundation.h>
+
+// This protocol is the common interface to the simple non-production
+// coordinators that will initialize, set up and present production view
+// controllers, usually with completely mocked data.
+@protocol Coordinator<NSObject>
+
+// The base view controller used to present the view controller that this
+// coordinator drives.
+@property(nonatomic, weak) UIViewController* baseViewController;
+
+// Typically, this initializes a view controller, sets it up and presents it.
+- (void)start;
+
+@end
+
+#endif  // IOS_SHOWCASE_COMMON_COORDINATOR_H_

ios/showcase/core/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("core") {
+  sources = [
+    "app_delegate.h",
+    "app_delegate.mm",
+    "showcase_model.h",
+    "showcase_model.mm",
+    "showcase_view_controller.h",
+    "showcase_view_controller.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/showcase/common",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("main") {
+  sources = [
+    "main.mm",
+  ]
+  deps = [
+    ":core",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("eg_tests") {
+  testonly = true
+  sources = [
+    "showcase_egtest.mm",
+  ]
+  deps = [
+    "//ios/showcase/test",
+    "//ios/third_party/earl_grey",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}

ios/showcase/core/Info.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>${IOS_BUNDLE_ID_PREFIX}.${PRODUCT_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIFileSharingEnabled</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

ios/showcase/core/LaunchScreen.storyboard

+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11542" systemVersion="16B2657" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="QI3-dQ-1cO">
+    <device id="retina5_5" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11524"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Navigation Controller-->
+        <scene sceneID="u0V-zC-FBB">
+            <objects>
+                <navigationController id="QI3-dQ-1cO" sceneMemberID="viewController">
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="ha0-fg-3GF">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </navigationBar>
+                    <connections>
+                        <segue destination="54D-Ky-HgW" kind="relationship" relationship="rootViewController" id="sjH-IV-Bd0"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="QaL-p0-lQo" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-513" y="-62"/>
+        </scene>
+        <!--Showcase-->
+        <scene sceneID="9lb-oL-wGX">
+            <objects>
+                <viewController id="54D-Ky-HgW" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="trb-La-da6"/>
+                        <viewControllerLayoutGuide type="bottom" id="MzX-hC-qOa"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="CAL-d9-rAz">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="736"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    </view>
+                    <navigationItem key="navigationItem" title="Showcase" id="9hL-yr-6we"/>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="o1d-CR-HVs" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="386" y="-60"/>
+        </scene>
+    </scenes>
+</document>

ios/showcase/core/app_delegate.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_CORE_APP_DELEGATE_H_
+#define IOS_SHOWCASE_CORE_APP_DELEGATE_H_
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder<UIApplicationDelegate>
+
+@property(strong, nonatomic) UIWindow* window;
+
+@end
+
+#endif  // IOS_SHOWCASE_CORE_APP_DELEGATE_H_

ios/showcase/core/app_delegate.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/core/app_delegate.h"
+
+#import "ios/showcase/core/showcase_model.h"
+#import "ios/showcase/core/showcase_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation AppDelegate
+@synthesize window = _window;
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  // Override point for customization after application launch.
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  ShowcaseViewController* viewController =
+      [[ShowcaseViewController alloc] initWithRows:[self rowsToDisplay]];
+  UINavigationController* navigationController = [[UINavigationController alloc]
+      initWithRootViewController:viewController];
+  self.window.rootViewController = navigationController;
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+#pragma mark - Private
+
+// Creates model data to display in the view controller.
+- (NSArray<showcase::ModelRow*>*)rowsToDisplay {
+  NSArray<showcase::ModelRow*>* rows = [ShowcaseModel model];
+  NSSortDescriptor* sortDescriptor =
+      [NSSortDescriptor sortDescriptorWithKey:showcase::kClassForDisplayKey
+                                    ascending:YES];
+  return [rows sortedArrayUsingDescriptors:@[ sortDescriptor ]];
+}
+
+@end

ios/showcase/core/main.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <UIKit/UIKit.h>
+#import "ios/showcase/core/app_delegate.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil,
+                             NSStringFromClass([AppDelegate class]));
+  }
+}

ios/showcase/core/showcase_egtest.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <EarlGrey/EarlGrey.h>
+
+#import "ios/showcase/test/showcase_test_case.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+// Tests for the core of the Showcase app.
+@interface ShowcaseCoreTestCase : ShowcaseTestCase
+@end
+
+@implementation ShowcaseCoreTestCase
+
+// Tests that Showcase title appears after launch.
+- (void)testLaunch {
+  [[EarlGrey selectElementWithMatcher:grey_text(@"Showcase")]
+      assertWithMatcher:grey_notNil()];
+}
+
+@end

ios/showcase/core/showcase_model.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_CORE_SHOWCASE_MODEL_H_
+#define IOS_SHOWCASE_CORE_SHOWCASE_MODEL_H_
+
+#import <Foundation/Foundation.h>
+
+#import "ios/showcase/core/showcase_view_controller.h"
+
+// Model object of rows to display in Showcase.
+@interface ShowcaseModel : NSObject
++ (NSArray<showcase::ModelRow*>*)model;
+@end
+
+#endif  // IOS_SHOWCASE_CORE_SHOWCASE_MODEL_H_

ios/showcase/core/showcase_model.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/core/showcase_model.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation ShowcaseModel
+
+// Insert additional rows in this array. All rows will be sorted upon
+// import into Showcase.
+// |kShowcaseClassForDisplayKey| and |kShowcaseClassForInstantiationKey| are
+// required. |kShowcaseUseCaseKey| is optional.
++ (NSArray<showcase::ModelRow*>*)model {
+  return @[
+    @{
+      showcase::kClassForDisplayKey : @"SettingsViewController",
+      showcase::kClassForInstantiationKey : @"SettingsCoordinator",
+      showcase::kUseCaseKey : @"Main settings screen",
+    },
+    @{
+      showcase::kClassForDisplayKey : @"MenuViewController",
+      showcase::kClassForInstantiationKey : @"MenuViewController",
+      showcase::kUseCaseKey : @"Tools menu",
+    },
+    @{
+      showcase::kClassForDisplayKey : @"UITableViewCell",
+      showcase::kClassForInstantiationKey : @"UIKitTableViewCellViewController",
+      showcase::kUseCaseKey : @"UIKit Table Cells",
+    },
+    @{
+      showcase::kClassForDisplayKey : @"TabGridViewController",
+      showcase::kClassForInstantiationKey : @"SCTabGridCoordinator",
+      showcase::kUseCaseKey : @"Tab grid",
+    },
+  ];
+}
+
+@end

ios/showcase/core/showcase_view_controller.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_CORE_SHOWCASE_VIEW_CONTROLLER_H_
+#define IOS_SHOWCASE_CORE_SHOWCASE_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+namespace showcase {
+
+// Required name for class that is intended to be tested.
+extern NSString* const kClassForDisplayKey;
+
+// Required name for class that will be instantiated.
+extern NSString* const kClassForInstantiationKey;
+
+// Optional description of the use case for the row.
+extern NSString* const kUseCaseKey;
+
+// Type for one row of model.
+typedef NSDictionary<NSString*, NSString*> ModelRow;
+
+}  // namespace showcase
+
+// TableViewController that displays a searchable list of rows.
+@interface ShowcaseViewController : UITableViewController
+// Initializes the tableView with a list of rows.
+- (instancetype)initWithRows:(NSArray<showcase::ModelRow*>*)rows
+    NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+- (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;
+- (instancetype)initWithNibName:(NSString*)nibNameOrNil
+                         bundle:(NSBundle*)nibBundleOrNil NS_UNAVAILABLE;
+- (instancetype)initWithStyle:(UITableViewStyle)style NS_UNAVAILABLE;
+@end
+
+#endif  // IOS_SHOWCASE_CORE_SHOWCASE_VIEW_CONTROLLER_H_

ios/showcase/core/showcase_view_controller.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/core/showcase_view_controller.h"
+
+#import "base/logging.h"
+#import "ios/showcase/common/coordinator.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace showcase {
+
+NSString* const kClassForDisplayKey = @"classForDisplay";
+NSString* const kClassForInstantiationKey = @"classForInstantiation";
+NSString* const kUseCaseKey = @"useCase";
+
+}  // namespace showcase
+
+@interface ShowcaseViewController ()<UITableViewDataSource,
+                                     UITableViewDelegate,
+                                     UISearchResultsUpdating>
+
+// Search controller that contains search bar.
+@property(nonatomic, strong) UISearchController* searchController;
+
+// Full data set displayed when tableView is not filtered.
+@property(nonatomic, strong) NSArray<showcase::ModelRow*>* allRows;
+
+// Displayed rows in tableView.
+@property(nonatomic, strong) NSArray<showcase::ModelRow*>* displayedRows;
+
+// Selected coordinator.
+@property(nonatomic, strong) id<Coordinator> activeCoordinator;
+
+@end
+
+@implementation ShowcaseViewController
+@synthesize searchController = _searchController;
+@synthesize allRows = _allRows;
+@synthesize displayedRows = _displayedRows;
+@synthesize activeCoordinator = _activeCoordinator;
+
+- (instancetype)initWithRows:(NSArray<showcase::ModelRow*>*)rows {
+  self = [super initWithStyle:UITableViewStylePlain];
+  if (self) {
+    self.allRows = [rows copy];
+    // Default to displaying all rows.
+    self.displayedRows = self.allRows;
+  }
+  return self;
+}
+
+#pragma mark - UIViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  self.title = @"Showcase";
+  self.tableView.tableFooterView = [[UIView alloc] init];
+  self.tableView.rowHeight = 70.0;
+
+  self.searchController =
+      [[UISearchController alloc] initWithSearchResultsController:nil];
+  self.searchController.searchResultsUpdater = self;
+  self.searchController.dimsBackgroundDuringPresentation = NO;
+  self.tableView.tableHeaderView = self.searchController.searchBar;
+
+  // Presentation of searchController will walk up the view controller hierarchy
+  // until it finds the root view controller or one that defines a presentation
+  // context. Make this class the presentation context so that the search
+  // controller does not present on top of the navigation controller.
+  self.definesPresentationContext = YES;
+}
+
+- (void)viewDidAppear:(BOOL)animated {
+  [super viewDidAppear:animated];
+  // Resets the current coordinator whenever the navigation controller pops
+  // back to this view controller.
+  self.activeCoordinator = nil;
+}
+
+#pragma mark - Table view data source
+
+- (NSInteger)tableView:(UITableView*)tableView
+    numberOfRowsInSection:(NSInteger)section {
+  return self.displayedRows.count;
+}
+
+- (UITableViewCell*)tableView:(UITableView*)tableView
+        cellForRowAtIndexPath:(NSIndexPath*)indexPath {
+  UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
+  if (!cell) {
+    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
+                                  reuseIdentifier:@"cell"];
+    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
+  }
+  showcase::ModelRow* row = self.displayedRows[indexPath.row];
+  cell.textLabel.text = row[showcase::kClassForDisplayKey];
+  cell.detailTextLabel.text = row[showcase::kUseCaseKey];
+  return cell;
+}
+
+#pragma mark - Table view delegate
+
+- (void)tableView:(UITableView*)tableView
+    didSelectRowAtIndexPath:(NSIndexPath*)indexPath {
+  showcase::ModelRow* row = self.displayedRows[indexPath.row];
+  Class classForInstantiation =
+      NSClassFromString(row[showcase::kClassForInstantiationKey]);
+  if ([classForInstantiation isSubclassOfClass:[UIViewController class]]) {
+    UIViewController* viewController = [[classForInstantiation alloc] init];
+    viewController.title = row[showcase::kUseCaseKey];
+    [self.navigationController pushViewController:viewController animated:YES];
+  } else if ([classForInstantiation
+                 conformsToProtocol:@protocol(Coordinator)]) {
+    self.activeCoordinator = [[classForInstantiation alloc] init];
+    self.activeCoordinator.baseViewController = self.navigationController;
+    [self.activeCoordinator start];
+  } else {
+    NOTREACHED();
+  }
+}
+
+#pragma mark - UISearchResultsUpdating
+
+- (void)updateSearchResultsForSearchController:
+    (UISearchController*)searchController {
+  [self filterContentForSearchText:searchController.searchBar.text];
+}
+
+#pragma mark - Private
+
+// Filters |allRows| for |searchText| and reloads the tableView with
+// animation. If |searchText| is empty, tableView will be loaded with |allRows|.
+- (void)filterContentForSearchText:(NSString*)searchText {
+  NSArray<showcase::ModelRow*>* newFilteredRows = self.allRows;
+
+  if (![self.searchController.searchBar.text isEqualToString:@""]) {
+    // The search is case-insensitive and searches both displayed texts.
+    NSIndexSet* matchingRows =
+        [self.allRows indexesOfObjectsPassingTest:^BOOL(
+                          showcase::ModelRow* row, NSUInteger idx, BOOL* stop) {
+          return [row[showcase::kClassForDisplayKey]
+                     localizedCaseInsensitiveContainsString:searchText] ||
+                 [row[showcase::kUseCaseKey]
+                     localizedCaseInsensitiveContainsString:searchText];
+        }];
+    newFilteredRows = [self.allRows objectsAtIndexes:matchingRows];
+  }
+
+  NSArray<NSIndexPath*>* indexPathsToInsert =
+      [self indexPathsToInsertFromArray:self.displayedRows
+                                toArray:newFilteredRows
+                       indexPathSection:0];
+  NSArray<NSIndexPath*>* indexPathsToDelete =
+      [self indexPathsToDeleteFromArray:self.displayedRows
+                                toArray:newFilteredRows
+                       indexPathSection:0];
+
+  [self.tableView beginUpdates];
+  [self.tableView insertRowsAtIndexPaths:indexPathsToInsert
+                        withRowAnimation:UITableViewRowAnimationFade];
+  [self.tableView deleteRowsAtIndexPaths:indexPathsToDelete
+                        withRowAnimation:UITableViewRowAnimationFade];
+  self.displayedRows = newFilteredRows;
+  [self.tableView endUpdates];
+}
+
+// Returns indexPaths that need to be inserted into the tableView.
+- (NSArray<NSIndexPath*>*)indexPathsToInsertFromArray:(NSArray*)fromArray
+                                              toArray:(NSArray*)toArray
+                                     indexPathSection:(NSUInteger)section {
+  NSMutableArray<NSIndexPath*>* indexPathsToInsert =
+      [[NSMutableArray alloc] init];
+  for (NSUInteger row = 0; row < toArray.count; row++) {
+    if (![fromArray containsObject:toArray[row]]) {
+      [indexPathsToInsert
+          addObject:[NSIndexPath indexPathForRow:row inSection:section]];
+    }
+  }
+  return indexPathsToInsert;
+}
+
+// Returns indexPaths that need to be deleted from the tableView.
+- (NSArray<NSIndexPath*>*)indexPathsToDeleteFromArray:(NSArray*)fromArray
+                                              toArray:(NSArray*)toArray
+                                     indexPathSection:(NSUInteger)section {
+  NSMutableArray<NSIndexPath*>* indexPathsToDelete =
+      [[NSMutableArray alloc] init];
+  for (NSUInteger row = 0; row < fromArray.count; row++) {
+    if (![toArray containsObject:fromArray[row]]) {
+      [indexPathsToDelete
+          addObject:[NSIndexPath indexPathForRow:row inSection:section]];
+    }
+  }
+  return indexPathsToDelete;
+}
+
+@end

ios/showcase/settings/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("settings") {
+  sources = [
+    "settings_coordinator.h",
+    "settings_coordinator.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/showcase/common",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}

ios/showcase/settings/settings_coordinator.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_SETTINGS_SETTINGS_COORDINATOR_H_
+#define IOS_SHOWCASE_SETTINGS_SETTINGS_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/showcase/common/coordinator.h"
+
+@interface SettingsCoordinator : NSObject<Coordinator>
+
+// Redefined to be a UINavigationController.
+@property(nonatomic, weak) UINavigationController* baseViewController;
+
+@end
+
+#endif  // IOS_SHOWCASE_SETTINGS_SETTINGS_COORDINATOR_H_

ios/showcase/settings/settings_coordinator.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/settings/settings_coordinator.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation SettingsCoordinator
+
+@synthesize baseViewController;
+
+- (void)start {
+  UIViewController* settings = [[UIViewController alloc] init];
+  settings.title = @"Settings";
+  settings.view.backgroundColor = [UIColor grayColor];
+  [self.baseViewController pushViewController:settings animated:YES];
+}
+
+@end

ios/showcase/tab_grid/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("tab_grid") {
+  sources = [
+    "sc_tab_grid_coordinator.h",
+    "sc_tab_grid_coordinator.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/chrome/browser/ui/tab_grid:tab_grid_ui",
+    "//ios/showcase/common",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("eg_tests") {
+  testonly = true
+  sources = [
+    "sc_tab_grid_egtest.mm",
+  ]
+  deps = [
+    "//ios/showcase/test",
+    "//ios/third_party/earl_grey",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}

ios/showcase/tab_grid/sc_tab_grid_coordinator.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_TAB_GRID_SC_TAB_GRID_COORDINATOR_H_
+#define IOS_SHOWCASE_TAB_GRID_SC_TAB_GRID_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/showcase/common/coordinator.h"
+
+@interface SCTabGridCoordinator : NSObject<Coordinator>
+// Redefined to be a UINavigationController.
+@property(nonatomic, weak) UINavigationController* baseViewController;
+@end
+
+#endif  // IOS_SHOWCASE_TAB_GRID_SC_TAB_GRID_COORDINATOR_H_

ios/showcase/tab_grid/sc_tab_grid_coordinator.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/tab_grid/sc_tab_grid_coordinator.h"
+
+#import "base/format_macros.h"
+#import "ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SCTabGridCoordinator ()<TabGridDataSource, TabGridActionDelegate>
+@property(nonatomic, strong) TabGridViewController* viewController;
+@end
+
+@implementation SCTabGridCoordinator
+@synthesize baseViewController = _baseViewController;
+@synthesize viewController = _viewController;
+
+- (void)start {
+  self.viewController = [[TabGridViewController alloc] init];
+  self.viewController.title = @"Tab Grid";
+  self.viewController.dataSource = self;
+  self.viewController.actionDelegate = self;
+  [self.baseViewController setHidesBarsOnSwipe:YES];
+  [self.baseViewController pushViewController:self.viewController animated:YES];
+}
+
+#pragma mark - TabGridDataSource
+
+- (NSUInteger)numberOfTabsInTabGrid {
+  return 3;
+}
+
+- (NSString*)titleAtIndex:(NSInteger)index {
+  return [NSString stringWithFormat:@"Tab %" PRIdNS, index];
+}
+
+#pragma mark - TabGridActionDelegate
+
+- (void)showTabAtIndexPath:(NSIndexPath*)indexPath {
+  [self
+      showAlertWithTitle:NSStringFromProtocol(@protocol(TabGridActionDelegate))
+                 message:[NSString
+                             stringWithFormat:@"showTabAtIndexPath:%" PRIdNS,
+                                              indexPath.item]];
+}
+
+- (void)showTabGrid {
+  [self
+      showAlertWithTitle:NSStringFromProtocol(@protocol(TabGridActionDelegate))
+                 message:NSStringFromSelector(_cmd)];
+}
+
+- (void)showSettings {
+  [self
+      showAlertWithTitle:NSStringFromProtocol(@protocol(TabGridActionDelegate))
+                 message:NSStringFromSelector(_cmd)];
+}
+
+#pragma mark - Private
+
+// Helper to show simple alert.
+- (void)showAlertWithTitle:(NSString*)title message:(NSString*)message {
+  UIAlertController* alertController =
+      [UIAlertController alertControllerWithTitle:title
+                                          message:message
+                                   preferredStyle:UIAlertControllerStyleAlert];
+  UIAlertAction* action =
+      [UIAlertAction actionWithTitle:@"Done"
+                               style:UIAlertActionStyleCancel
+                             handler:nil];
+  [alertController addAction:action];
+  [self.baseViewController presentViewController:alertController
+                                        animated:YES
+                                      completion:nil];
+}
+
+@end

ios/showcase/tab_grid/sc_tab_grid_egtest.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <EarlGrey/EarlGrey.h>
+
+#import "ios/showcase/test/showcase_test_case.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+// Tests for the tab grid view controller.
+@interface SCTabGridTestCase : ShowcaseTestCase
+@end
+
+@implementation SCTabGridTestCase
+
+// Tests launching TabGridViewController and tapping a cell.
+- (void)testLaunchAndTappingCell {
+  [[EarlGrey selectElementWithMatcher:grey_text(@"TabGridViewController")]
+      performAction:grey_tap()];
+  [[EarlGrey selectElementWithMatcher:grey_text(@"Tab 0")]
+      performAction:grey_tap()];
+  [[EarlGrey selectElementWithMatcher:grey_text(@"TabGridActionDelegate")]
+      assertWithMatcher:grey_notNil()];
+  [[EarlGrey selectElementWithMatcher:grey_text(@"Done")]
+      performAction:grey_tap()];
+}
+
+@end

ios/showcase/test/BUILD.gn

@@ -2,9 +2,18 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# This empty target is there to help with upstreaming by removing a manual
-# step from the process (updating the //ios:all target). It will be changed
-# to a real target as part of upstreaming.
-group("all_tests") {
+source_set("test") {
   testonly = true
+  sources = [
+    "showcase_test_case.h",
+    "showcase_test_case.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/third_party/earl_grey",
+  ]
+  public_deps = [
+    "//build/config/ios:xctest",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
 }

ios/showcase/test/showcase_test_case.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_TEST_SHOWCASE_TEST_CASE_H_
+#define IOS_SHOWCASE_TEST_SHOWCASE_TEST_CASE_H_
+
+#import <XCTest/XCTest.h>
+
+// Base class for all Showcase Earl Grey tests.
+@interface ShowcaseTestCase : XCTestCase
+@end
+
+#endif  // IOS_SHOWCASE_TEST_SHOWCASE_TEST_CASE_H_

ios/showcase/test/showcase_test_case.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/test/showcase_test_case.h"
+
+#import <EarlGrey/EarlGrey.h>
+
+#import "base/logging.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation ShowcaseTestCase
+
+// Overrides testInvocations so the set of tests run can be modified, as
+// necessary.
++ (NSArray*)testInvocations {
+  NSError* error = nil;
+  [[EarlGrey selectElementWithMatcher:grey_systemAlertViewShown()]
+      assertWithMatcher:grey_nil()
+                  error:&error];
+  if (error != nil) {
+    LOG(ERROR) << "System alert view is present, so skipping all tests.";
+    return @[];
+  }
+  return [super testInvocations];
+}
+
+@end

ios/showcase/uikit_table_view_cell/BUILD.gn

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("uikit_table_view_cell") {
+  sources = [
+    "uikit_table_view_cell_view_controller.h",
+    "uikit_table_view_cell_view_controller.mm",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}

ios/showcase/uikit_table_view_cell/uikit_table_view_cell_view_controller.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_SHOWCASE_UIKIT_TABLE_VIEW_CELL_UIKIT_TABLE_VIEW_CELL_VIEW_CONTROLLER_H_
+#define IOS_SHOWCASE_UIKIT_TABLE_VIEW_CELL_UIKIT_TABLE_VIEW_CELL_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+@interface UIKitTableViewCellViewController : UITableViewController
+@end
+
+#endif  // IOS_SHOWCASE_UIKIT_TABLE_VIEW_CELL_UIKIT_TABLE_VIEW_CELL_VIEW_CONTROLLER_H_

ios/showcase/uikit_table_view_cell/uikit_table_view_cell_view_controller.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/showcase/uikit_table_view_cell/uikit_table_view_cell_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation UIKitTableViewCellViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  self.tableView.tableFooterView = [[UIView alloc] init];
+  self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
+}
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView*)tableView {
+  return 4;
+}
+
+- (NSInteger)tableView:(UITableView*)tableView
+    numberOfRowsInSection:(NSInteger)section {
+  return 1;
+}
+
+- (NSString*)tableView:(UITableView*)tableView
+    titleForHeaderInSection:(NSInteger)section {
+  switch ([self styleForSection:section]) {
+    case UITableViewCellStyleDefault:
+      return @"Default Style";
+    case UITableViewCellStyleValue1:
+      return @"Value 1 Style";
+    case UITableViewCellStyleValue2:
+      return @"Value 2 Style";
+    case UITableViewCellStyleSubtitle:
+      return @"Subtitle Style";
+  }
+}
+
+- (UITableViewCell*)tableView:(UITableView*)tableView
+        cellForRowAtIndexPath:(NSIndexPath*)indexPath {
+  UITableViewCellStyle style = [self styleForSection:indexPath.section];
+  NSString* reuseIdentifier = @(style).stringValue;
+  UITableViewCell* cell =
+      [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
+  if (!cell) {
+    cell = [[UITableViewCell alloc] initWithStyle:style
+                                  reuseIdentifier:reuseIdentifier];
+  }
+  cell.textLabel.text = @"Text";
+  cell.detailTextLabel.text = @"Detail Text";
+  return cell;
+}
+
+#pragma mark - Private
+
+- (UITableViewCellStyle)styleForSection:(NSInteger)section {
+  NSAssert(section >= 0, @"");
+  NSAssert(section < 4, @"");
+  return (UITableViewCellStyle)section;
+}
+
+@end