Enable flag TabToGTSAnimation by default

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

TBR=twellington@chromium.org

Bug: 964406
Change-Id: I3a23e20511f9ecb48ed70fd6952f36b06191817c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1743106
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689627}

chrome/android/java/src/org/chromium/chrome/browser/util/FeatureUtilities.java

@@ -802,7 +802,7 @@ public class FeatureUtilities {
     private static class GridTabSwitcherUtil {
         // Field trial parameter for the minimum Android SDK version to enable zooming animation.
         private static final String MIN_SDK_PARAM = "zooming-min-sdk-version";
-        private static final int DEFAULT_MIN_SDK = Build.VERSION_CODES.O;
+        private static final int DEFAULT_MIN_SDK = Build.VERSION_CODES.M;
 
         // Field trial parameter for the minimum physical memory size to enable zooming animation.
         private static final String MIN_MEMORY_MB_PARAM = "zooming-min-memory-mb";

chrome/browser/android/chrome_feature_list.cc

@@ -549,7 +549,7 @@ 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 kTrustedWebActivity{"TrustedWebActivity",
                                         base::FEATURE_ENABLED_BY_DEFAULT};