services/ui: Detect when a video is playing

cc/ipc/compositor_frame_metadata_struct_traits.h

 // Copyright 2016 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 CC_IPC_COMPOSITOR_FRAME_METADATA_STRUCT_TRAITS_H_
 #define CC_IPC_COMPOSITOR_FRAME_METADATA_STRUCT_TRAITS_H_
 
 #include "cc/ipc/compositor_frame_metadata.mojom.h"
 #include "cc/output/compositor_frame_metadata.h"
 
@@ skipping 39 matching lines @@
   static bool root_overflow_x_hidden(
       const cc::CompositorFrameMetadata& metadata) {
     return metadata.root_overflow_x_hidden;
   }
 
   static bool root_overflow_y_hidden(
       const cc::CompositorFrameMetadata& metadata) {
     return metadata.root_overflow_y_hidden;
   }
 
+  static bool may_contain_video(const cc::CompositorFrameMetadata& metadata) {
+    return metadata.may_contain_video;
+  }
+
   static bool is_resourceless_software_draw_with_scroll_or_animation(
       const cc::CompositorFrameMetadata& metadata) {
     return metadata.is_resourceless_software_draw_with_scroll_or_animation;
   }
 
   static gfx::Vector2dF location_bar_offset(
       const cc::CompositorFrameMetadata& metadata) {
     return metadata.location_bar_offset;
   }
 
@@ skipping 27 matching lines @@
     return metadata.referenced_surfaces;
   }
 
   static bool Read(cc::mojom::CompositorFrameMetadataDataView data,
                    cc::CompositorFrameMetadata* out);
 };
 
 }  // namespace mojo
 
 #endif  // CC_IPC_COMPOSITOR_FRAME_METADATA_STRUCT_TRAITS_H_