Cache TabGroupsContinuation feature flag

http://crrev.com/c/1934832 introduces the flag check for
TabGroupsContinuation in isGridTabSwitcherEnabled() which could happen
before native is started. This means that we need to cache the
TabGroupsContinuation flag as well. This CL fixes this issue and fixes
related tests.

Bug: 1057586
Change-Id: I4edaca4c202bdd19d2da04a5224d727100673947
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2085601
Commit-Queue: Yue Zhang <yuezhanggg@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747058}

chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabUiFeatureUtilities.java

@@ -69,7 +69,8 @@ public class TabUiFeatureUtilities {
         }
         return Arrays.asList(ChromeFeatureList.TAB_GRID_LAYOUT_ANDROID,
                 ChromeFeatureList.TAB_GROUPS_ANDROID,
-                ChromeFeatureList.DUET_TABSTRIP_INTEGRATION_ANDROID);
+                ChromeFeatureList.DUET_TABSTRIP_INTEGRATION_ANDROID,
+                ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID);
     }
 
     private static boolean isEligibleForTabUiExperiments() {
@@ -86,7 +87,7 @@ public class TabUiFeatureUtilities {
         // TODO(yusufo): AccessibilityLayout check should not be here and the flow should support
         // changing that setting while Chrome is alive.
         // Having Tab Groups or Start implies Grid Tab Switcher.
-        return !(ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID)
+        return !(CachedFeatureFlags.isEnabled(ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID)
                        && SysUtils.isLowEndDevice())
                 && CachedFeatureFlags.isEnabled(ChromeFeatureList.TAB_GRID_LAYOUT_ANDROID)
                 && isTabManagementModuleSupported()
@@ -115,7 +116,7 @@ public class TabUiFeatureUtilities {
      */
     public static boolean isTabGroupsAndroidContinuationEnabled() {
         return isTabGroupsAndroidEnabled()
-                && ChromeFeatureList.isEnabled(ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID);
+                && CachedFeatureFlags.isEnabled(ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID);
     }
 
     /**

chrome/android/java/src/org/chromium/chrome/browser/flags/CachedFeatureFlags.java

@@ -63,6 +63,7 @@ public class CachedFeatureFlags {
             put(ChromeFeatureList.PAINT_PREVIEW_TEST, false);
             put(ChromeFeatureList.TAB_GRID_LAYOUT_ANDROID, false);
             put(ChromeFeatureList.TAB_GROUPS_ANDROID, false);
+            put(ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID, false);
             put(ChromeFeatureList.DUET_TABSTRIP_INTEGRATION_ANDROID, false);
             put(ChromeFeatureList.SHARE_BUTTON_IN_TOP_TOOLBAR, false);
             put(ChromeFeatureList.TEST_DEFAULT_DISABLED, false);