[iOS] Modernise QuickLook coordinator

This CL modernizes the ARQuickLookCoordinator to use the superclass
-initWithBaseViewController:browser: initializer, and to remove the
spurious injection of BrowserState and WebStateList.

It also updates the coordinator's unit test, using the new TestBrowser()
constructor.

Bug: 1029346
Change-Id: I29f6e14409dc66b34da36126d0ea7e516323ddaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943240
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721514}

ios/chrome/browser/ui/browser_view/browser_coordinator.mm

@@ -287,8 +287,7 @@
 
   self.ARQuickLookCoordinator = [[ARQuickLookCoordinator alloc]
       initWithBaseViewController:self.viewController
-                    browserState:self.browserState
-                    webStateList:self.browser->GetWebStateList()];
+                         browser:self.browser];
   [self.ARQuickLookCoordinator start];
 
   self.injectionHandler = [[ManualFillInjectionHandler alloc]

ios/chrome/browser/ui/download/BUILD.gn

@@ -37,6 +37,7 @@ source_set("download") {
     "//ios/chrome/browser",
     "//ios/chrome/browser/download",
     "//ios/chrome/browser/infobars",
+    "//ios/chrome/browser/main",
     "//ios/chrome/browser/store_kit",
     "//ios/chrome/browser/ui/alert_coordinator",
     "//ios/chrome/browser/ui/colors",
@@ -81,6 +82,7 @@ source_set("unit_tests") {
     "//ios/chrome/browser/download",
     "//ios/chrome/browser/download:test_support",
     "//ios/chrome/browser/infobars",
+    "//ios/chrome/browser/main:test_support",
     "//ios/chrome/browser/ui/util",
     "//ios/chrome/browser/web:test_support",
     "//ios/chrome/browser/web_state_list:test_support",

ios/chrome/browser/ui/download/ar_quick_look_coordinator.h

@@ -27,19 +27,10 @@ enum class PresentQLPreviewController {
   kMaxValue = kAnotherViewControllerIsPresented,
 };
 
-class WebStateList;
-
 // Presents QLPreviewController in order to display USDZ format 3D models.
 @interface ARQuickLookCoordinator : ChromeCoordinator
 
-// Creates a coordinator that uses a |viewController| a |browserState| and
-// a |webStateList|.
-- (instancetype)initWithBaseViewController:(UIViewController*)viewController
-                              browserState:
-                                  (ios::ChromeBrowserState*)browserState
-                              webStateList:(WebStateList*)webStateList;
-
-// Unavailable, use -initWithBaseViewController:browserState:webStateList:.
+// Unavailable, use -initWithBaseViewController:browser:
 - (instancetype)initWithBaseViewController:(UIViewController*)viewController
                               browserState:
                                   (ios::ChromeBrowserState*)browserState

ios/chrome/browser/ui/download/ar_quick_look_coordinator.mm

@@ -13,6 +13,7 @@
 #include "base/scoped_observer.h"
 #import "ios/chrome/browser/download/ar_quick_look_tab_helper.h"
 #import "ios/chrome/browser/download/ar_quick_look_tab_helper_delegate.h"
+#import "ios/chrome/browser/main/browser.h"
 #import "ios/chrome/browser/web_state_list/web_state_list.h"
 #import "ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h"
 
@@ -58,7 +59,7 @@ PresentQLPreviewController GetHistogramEnum(
 }
 
 // The WebStateList being observed.
-@property(nonatomic, assign) WebStateList* webStateList;
+@property(nonatomic, readonly) WebStateList* webStateList;
 
 // Whether the coordinator is started.
 @property(nonatomic, assign) BOOL started;
@@ -74,17 +75,8 @@ PresentQLPreviewController GetHistogramEnum(
 
 @implementation ARQuickLookCoordinator
 
-- (instancetype)initWithBaseViewController:(UIViewController*)viewController
-                              browserState:
-                                  (ios::ChromeBrowserState*)browserState
-                              webStateList:(WebStateList*)webStateList {
-  DCHECK(webStateList);
-  self = [super initWithBaseViewController:viewController
-                              browserState:browserState];
-  if (self) {
-    _webStateList = webStateList;
-  }
-  return self;
+- (WebStateList*)webStateList {
+  return self.browser->GetWebStateList();
 }
 
 - (void)start {

ios/chrome/browser/ui/download/ar_quick_look_coordinator_unittest.mm

@@ -14,9 +14,11 @@
 #include "base/strings/sys_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "base/test/metrics/histogram_tester.h"
+#include "base/test/task_environment.h"
 #import "ios/chrome/browser/download/ar_quick_look_tab_helper.h"
 #import "ios/chrome/browser/download/ar_quick_look_tab_helper_delegate.h"
 #include "ios/chrome/browser/download/download_test_util.h"
+#import "ios/chrome/browser/main/test_browser.h"
 #include "ios/chrome/browser/ui/util/ui_util.h"
 #import "ios/chrome/browser/web_state_list/fake_web_state_list_delegate.h"
 #import "ios/chrome/browser/web_state_list/web_state_list.h"
@@ -49,12 +51,10 @@ class ARQuickLookCoordinatorTest : public PlatformTest {
  protected:
   ARQuickLookCoordinatorTest()
       : base_view_controller_([[UIViewController alloc] init]),
-        web_state_list_(
-            std::make_unique<WebStateList>(&web_state_list_delegate_)),
+        browser_(std::make_unique<TestBrowser>()),
         coordinator_([[ARQuickLookCoordinator alloc]
             initWithBaseViewController:base_view_controller_
-                          browserState:nullptr
-                          webStateList:web_state_list_.get()]) {
+                               browser:browser_.get()]) {
     [scoped_key_window_.Get() setRootViewController:base_view_controller_];
 
     // The Coordinator should install itself as delegate for the existing
@@ -62,9 +62,9 @@ class ARQuickLookCoordinatorTest : public PlatformTest {
     auto web_state = std::make_unique<web::TestWebState>();
     auto* web_state_ptr = web_state.get();
     ARQuickLookTabHelper::CreateForWebState(web_state_ptr);
-    web_state_list_->InsertWebState(0, std::move(web_state),
-                                    WebStateList::INSERT_NO_FLAGS,
-                                    WebStateOpener());
+    browser_->GetWebStateList()->InsertWebState(0, std::move(web_state),
+                                                WebStateList::INSERT_NO_FLAGS,
+                                                WebStateOpener());
     [coordinator_ start];
   }
 
@@ -72,12 +72,14 @@ class ARQuickLookCoordinatorTest : public PlatformTest {
 
   ARQuickLookTabHelper* tab_helper() {
     return ARQuickLookTabHelper::FromWebState(
-        web_state_list_->GetWebStateAt(0));
+        browser_->GetWebStateList()->GetWebStateAt(0));
   }
 
+  // Needed for test browser state created by TestBrowser().
+  base::test::TaskEnvironment task_environment_;
+
   UIViewController* base_view_controller_;
-  FakeWebStateListDelegate web_state_list_delegate_;
-  std::unique_ptr<WebStateList> web_state_list_;
+  std::unique_ptr<Browser> browser_;
   ARQuickLookCoordinator* coordinator_;
   ScopedKeyWindow scoped_key_window_;
   base::HistogramTester histogram_tester_;
@@ -86,21 +88,14 @@ class ARQuickLookCoordinatorTest : public PlatformTest {
 // Tests that the coordinator installs itself as a ARQuickLookTabHelper
 // delegate when ARQuickLookTabHelper instances become available.
 TEST_F(ARQuickLookCoordinatorTest, InstallDelegates) {
-  WebStateList web_state_list(&web_state_list_delegate_);
-  ARQuickLookCoordinator* coordinator = [[ARQuickLookCoordinator alloc]
-      initWithBaseViewController:base_view_controller_
-                    browserState:nullptr
-                    webStateList:&web_state_list];
-  [coordinator start];
-
   // Coordinator should install itself as delegate for a new web state.
   auto web_state2 = std::make_unique<web::TestWebState>();
   auto* web_state_ptr2 = web_state2.get();
   ARQuickLookTabHelper::CreateForWebState(web_state_ptr2);
   EXPECT_FALSE(ARQuickLookTabHelper::FromWebState(web_state_ptr2)->delegate());
-  web_state_list.InsertWebState(0, std::move(web_state2),
-                                WebStateList::INSERT_NO_FLAGS,
-                                WebStateOpener());
+  browser_->GetWebStateList()->InsertWebState(0, std::move(web_state2),
+                                              WebStateList::INSERT_NO_FLAGS,
+                                              WebStateOpener());
   EXPECT_TRUE(ARQuickLookTabHelper::FromWebState(web_state_ptr2)->delegate());
 
   // Coordinator should install itself as delegate for a web state replacing an
@@ -109,10 +104,8 @@ TEST_F(ARQuickLookCoordinatorTest, InstallDelegates) {
   auto* web_state_ptr3 = web_state3.get();
   ARQuickLookTabHelper::CreateForWebState(web_state_ptr3);
   EXPECT_FALSE(ARQuickLookTabHelper::FromWebState(web_state_ptr3)->delegate());
-  web_state_list.ReplaceWebStateAt(0, std::move(web_state3));
+  browser_->GetWebStateList()->ReplaceWebStateAt(0, std::move(web_state3));
   EXPECT_TRUE(ARQuickLookTabHelper::FromWebState(web_state_ptr3)->delegate());
-
-  [coordinator stop];
 }
 
 // Tests presenting a valid USDZ file.