[Display Cutout] Launch on Android

Launch the Display Cutout API and the media controls cutout
gesture on Android.

Intent to ship: https://groups.google.com/a/chromium.org/d/msg/blink-dev/Fim-KmT08PE/LIHNNXALBAAJ

BUG=848890

Change-Id: If799b9ef553ddfdc7a13bd9a355e0f2f67ac6907
Reviewed-on: https://chromium-review.googlesource.com/1122855Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571953}

content/public/common/content_features.cc

@@ -610,7 +610,7 @@ const base::Feature kAndroidAutofillAccessibility{
 // Enables developers to use the CSS safe-area-* and viewport-fit APIs which
 // allow them to support devices with a display cutout.
 const base::Feature kDisplayCutoutAPI{"DisplayCutoutAPI",
-                                      base::FEATURE_DISABLED_BY_DEFAULT};
+                                      base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables hiding incorrectly-sized frames while in fullscreen.
 const base::Feature kHideIncorrectlySizedFullscreenFrames{

media/base/media_switches.cc

@@ -354,7 +354,7 @@ const base::Feature kAutoplayIgnoreWebAudio{"AutoplayIgnoreWebAudio",
 #if defined(OS_ANDROID)
 // Enable a gesture to make the media controls expaned into the display cutout.
 const base::Feature kMediaControlsExpandGesture{
-    "MediaControlsExpandGesture", base::FEATURE_DISABLED_BY_DEFAULT};
+    "MediaControlsExpandGesture", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Lock the screen orientation when a video goes fullscreen.
 const base::Feature kVideoFullscreenOrientationLock{