[Media Controls] Use native media controls in Chrome OS video player

Hide default controls and use native controls.

Bug: 909963
Change-Id: Ifa40d499243244fbae8175a13f7bdcfacd8ca199
Reviewed-on: https://chromium-review.googlesource.com/c/1354262
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Luciano Pacheco <[email protected]>
Reviewed-by: Tommy Steimel <[email protected]>
Reviewed-by: Yoshiki Iguchi <[email protected]>
Reviewed-by: Mounir Lamouri <[email protected]>
Commit-Queue: Jazz Xu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#616528}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index fd7d6ca2..45011937 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -4068,6 +4068,13 @@
      FEATURE_VALUE_TYPE(chromeos::features::kMyFilesVolume)},
 #endif  // OS_CHROMEOS
 
+#if defined(OS_CHROMEOS)
+    {"enable-native-controls",
+     flag_descriptions::kEnableVideoPlayerNativeControlsName,
+     flag_descriptions::kEnableVideoPlayerNativeControlsDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::features::kVideoPlayerNativeControls)},
+#endif
+
 #if defined(OS_ANDROID)
     {"background-task-component-update",
      flag_descriptions::kBackgroundTaskComponentUpdateName,