[ios] Creates Recent Tabs UI Reboot Feature flag.

Bug: 805013
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I0b9ed58466af7b0c7ea092d8210683ba510502d4
Reviewed-on: https://chromium-review.googlesource.com/916808
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536917}

ios/chrome/browser/BUILD.gn

@@ -125,6 +125,7 @@ source_set("browser") {
     "//ios/chrome/browser/ui/external_search:features",
     "//ios/chrome/browser/ui/history:history_base_feature",
     "//ios/chrome/browser/ui/main:feature_flags",
+    "//ios/chrome/browser/ui/ntp/recent_tabs:base_feature",
     "//ios/chrome/browser/ui/omnibox",
     "//ios/chrome/browser/ui/toolbar/public:toolbar_base_feature",
     "//ios/chrome/common",

ios/chrome/browser/about_flags.mm

@@ -45,6 +45,7 @@
 #include "ios/chrome/browser/ui/external_search/features.h"
 #import "ios/chrome/browser/ui/history/history_base_feature.h"
 #include "ios/chrome/browser/ui/main/main_feature_flags.h"
+#import "ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_feature.h"
 #import "ios/chrome/browser/ui/omnibox/omnibox_clipping_feature.h"
 #import "ios/chrome/browser/ui/toolbar/public/toolbar_controller_base_feature.h"
 #include "ios/chrome/browser/ui/ui_feature_flags.h"
@@ -224,6 +225,9 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"ui-refresh-phase-1", flag_descriptions::kUIRefreshPhase1Name,
      flag_descriptions::kUIRefreshPhase1Description, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(kUIRefreshPhase1)},
+    {"recent-tabs-ui-reboot", flag_descriptions::kRecentTabsUIRebootName,
+     flag_descriptions::kRecentTabsUIRebootDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(kRecentTabsUIReboot)},
     {"context-menu-element-post-message",
      flag_descriptions::kContextMenuElementPostMessageName,
      flag_descriptions::kContextMenuElementPostMessageDescription,

ios/chrome/browser/experimental_flags.h

@@ -54,6 +54,9 @@ bool IsNewFeedbackKitEnabled();
 // Whether the 3rd party keyboard omnibox workaround is enabled.
 bool IsThirdPartyKeyboardWorkaroundEnabled();
 
+// Whether RecentTabs UI Reboot is enabled.
+bool IsRecentTabsUIRebootEnabled();
+
 // Whether the application group sandbox must be cleared before starting.
 // Calling this method will reset the flag to false, so the sandbox is cleared
 // only once.

ios/chrome/browser/experimental_flags.mm

@@ -23,6 +23,7 @@
 #include "components/signin/core/browser/signin_switches.h"
 #include "components/variations/variations_associated_data.h"
 #include "ios/chrome/browser/chrome_switches.h"
+#import "ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_feature.h"
 #include "ios/web/public/web_view_creation_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -125,4 +126,8 @@ bool IsThirdPartyKeyboardWorkaroundEnabled() {
   return base::FeatureList::IsEnabled(kEnableThirdPartyKeyboardWorkaround);
 }
 
+bool IsRecentTabsUIRebootEnabled() {
+  return base::FeatureList::IsEnabled(kRecentTabsUIReboot);
+}
+
 }  // namespace experimental_flags

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -96,6 +96,10 @@ const char kPhysicalWebDescription[] =
     "When enabled, the omnibox will include suggestions for web pages "
     "broadcast by devices near you.";
 
+const char kRecentTabsUIRebootName[] = "Recent Tabs UI Reboot";
+const char kRecentTabsUIRebootDescription[] =
+    "When enabled, Recent Tabs will use the new UI Reboot stack.";
+
 const char kShareCanonicalURLName[] = "Share Canonical URL";
 const char kShareCanonicalURLDescription[] =
     "When enabled, the current page's canonical URL is shared (if it exists) "

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -83,6 +83,11 @@ extern const char kPasswordExportDescription[];
 extern const char kPhysicalWeb[];
 extern const char kPhysicalWebDescription[];
 
+// Title and description for the flag to enable the new UI Reboot on Recent
+// Tabs.
+extern const char kRecentTabsUIRebootName[];
+extern const char kRecentTabsUIRebootDescription[];
+
 // Title and description for the flag to share the canonical URL of the
 // current page instead of the visible URL.
 extern const char kShareCanonicalURLName[];

ios/chrome/browser/ui/ntp/recent_tabs/BUILD.gn

@@ -58,6 +58,17 @@ source_set("recent_tabs") {
   libs = [ "UIKit.framework" ]
 }
 
+source_set("base_feature") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [
+    "recent_tabs_feature.h",
+    "recent_tabs_feature.mm",
+  ]
+  deps = [
+    "//base",
+  ]
+}
+
 source_set("unit_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true

ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_feature.h

+// Copyright 2018 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_CHROME_BROWSER_UI_NTP_RECENT_TABS_RECENT_TABS_FEATURE_H_
+#define IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_RECENT_TABS_FEATURE_H_
+
+#include "base/feature_list.h"
+
+// Feature to choose whether to use the new UI Reboot stack, or the legacy one.
+extern const base::Feature kRecentTabsUIReboot;
+
+#endif  // IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_RECENT_TABS_FEATURE_H_

ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_feature.mm

+// Copyright 2018 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/chrome/browser/ui/ntp/recent_tabs/recent_tabs_feature.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+const base::Feature kRecentTabsUIReboot{"RecentTabsUIReboot",
+                                        base::FEATURE_DISABLED_BY_DEFAULT};