services/ui: Detect when a video is playing

cc/layers/layer.h

 // Copyright 2010 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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 453 matching lines @@
   }
 
   void set_clip_rect(const gfx::Rect& rect) {}
 
   void SetSubtreePropertyChanged();
   bool subtree_property_changed() const { return subtree_property_changed_; }
 
   void SetLayerPropertyChanged();
   bool layer_property_changed() const { return layer_property_changed_; }
 
+  void SetMayContainVideo(bool yes);
+
   void DidBeginTracing();
 
   int num_copy_requests_in_target_subtree();
 
   void SetElementId(ElementId id);
   ElementId element_id() const { return inputs_.element_id; }
 
   void SetMutableProperties(uint32_t properties);
   uint32_t mutable_properties() const { return inputs_.mutable_properties; }
 
@@ skipping 217 matching lines @@
   int scroll_tree_index_;
   int property_tree_sequence_number_;
   gfx::Vector2dF offset_to_transform_parent_;
   bool should_flatten_transform_from_property_tree_ : 1;
   bool draws_content_ : 1;
   bool use_local_transform_for_backface_visibility_ : 1;
   bool should_check_backface_visibility_ : 1;
   bool force_render_surface_for_testing_ : 1;
   bool subtree_property_changed_ : 1;
   bool layer_property_changed_ : 1;
+  bool may_contain_video_ : 1;
   SkColor safe_opaque_background_color_;
   // draw_blend_mode may be different than blend_mode_,
   // when a RenderSurface re-parents the layer's blend_mode.
   SkXfermode::Mode draw_blend_mode_;
   std::unique_ptr<std::set<Layer*>> scroll_children_;
 
   std::unique_ptr<std::set<Layer*>> clip_children_;
 
   PaintProperties paint_properties_;
 
   // These all act like draw properties, so don't need push properties.
   gfx::Rect visible_layer_rect_;
   size_t num_unclipped_descendants_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_