Enable flag TabToGTSAnimation by default again

Also update the default parameter of zooming-min-sdk-version to M.

Bug: 964406
Change-Id: I90d35c365b690d788a6284a610a3828334e98cf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2114392
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753160}

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

@@ -64,7 +64,7 @@ public class TabUiFeatureUtilities {
     public static final String MIN_SDK_PARAM = "zooming-min-sdk-version";
     public static final IntCachedFieldTrialParameter ZOOMING_MIN_SDK =
             new IntCachedFieldTrialParameter(
-                    ChromeFeatureList.TAB_TO_GTS_ANIMATION, MIN_SDK_PARAM, Build.VERSION_CODES.O);
+                    ChromeFeatureList.TAB_TO_GTS_ANIMATION, MIN_SDK_PARAM, Build.VERSION_CODES.M);
     // Field trial parameter for the minimum physical memory size to enable zooming animation.
     public static final String MIN_MEMORY_MB_PARAM = "zooming-min-memory-mb";
     public static final IntCachedFieldTrialParameter ZOOMING_MIN_MEMORY =

chrome/browser/flags/android/chrome_feature_list.cc

@@ -567,7 +567,7 @@ const base::Feature kTabSwitcherOnReturn{"TabSwitcherOnReturn",
                                          base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kTabToGTSAnimation{"TabToGTSAnimation",
-                                       base::FEATURE_DISABLED_BY_DEFAULT};
+                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kTestDefaultDisabled{"TestDefaultDisabled",
                                          base::FEATURE_DISABLED_BY_DEFAULT};