Adds video-surface feature switch.

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index 53b635b1ab4ae331bf4939fb47dbec4e7ca87593..5db7aebbed789532bf3ccc786481d95e89286319 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -243,6 +243,10 @@ const base::Feature kUseNewMediaCache{"use-new-media-cache",
 const base::Feature kVideoColorManagement{"video-color-management",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Use SurfaceLayer instead of VideoLayer.
+const base::Feature kUseSurfaceLayerForVideo{"UseSurfaceLayerForVideo",
+                                             base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Inform video blitter of video color space.
 const base::Feature kVideoBlitColorAccuracy{"video-blit-color-accuracy",
                                             base::FEATURE_DISABLED_BY_DEFAULT};