Add flag to signal that video frame must be drawn using an overlay.

media/base/video_frame_metadata.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_VIDEO_FRAME_METADATA_H_
 #define MEDIA_BASE_VIDEO_FRAME_METADATA_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 96 matching lines @@
     // Android only: if set, then this frame is not suitable for overlay, even
     // if ALLOW_OVERLAY is set.  However, it allows us to process the overlay
     // to see if it would have been promoted, if it were backed by a SurfaceView
     // instead.  This lets us figure out when SurfaceViews are appropriate.
     SURFACE_TEXTURE,
 
     // Android only: if set, then this frame's resource would like to be
     // notified about its promotability to an overlay.
     WANTS_PROMOTION_HINT,
 
+    // Windows only: if set, then this frame must be displayed in an overlay
+    // rahter than with the GLRenderer.

[danakj, 2017/06/07 15:26:40]

typo: rather

maybe instead of naming the GLRenderer here, "rather than being composited into
the framebuffer" ?

+    REQUIRE_OVERLAY,
+
     NUM_KEYS
   };
 
   VideoFrameMetadata();
   ~VideoFrameMetadata();
 
   bool HasKey(Key key) const;
 
   void Clear() { dictionary_.Clear(); }
 
@@ skipping 33 matching lines @@
   const base::Value* GetBinaryValue(Key key) const;
 
   base::DictionaryValue dictionary_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoFrameMetadata);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_METADATA_H_