services/ui: Detect when a video is playing

services/ui/ws/frame_generator.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 SERVICES_UI_WS_FRAME_GENERATOR_H_
 #define SERVICES_UI_WS_FRAME_GENERATOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 46 matching lines @@
   // TODO(fsamuel): This should use vblank as a signal rather than a timer
   // http://crbug.com/533042
   void Draw();
 
   // This is called after the DisplayCompositor has completed generating a new
   // frame for the display. TODO(fsamuel): Idle time processing should happen
   // here if there is budget for it.
   void DidDraw();
 
   // Generates the CompositorFrame for the current |dirty_rect_|.
-  cc::CompositorFrame GenerateCompositorFrame();
+  cc::CompositorFrame GenerateCompositorFrame(
+      const gfx::Rect& output_rect) const;
 
   // DrawWindowTree recursively visits ServerWindows, creating a SurfaceDrawQuad
   // for each that lacks one.
   void DrawWindowTree(cc::RenderPass* pass,
                       ServerWindow* window,
                       const gfx::Vector2d& parent_to_root_origin_offset,
-                      float opacity);
+                      float opacity,
+                      bool* may_contain_video) const;
 
   FrameGeneratorDelegate* delegate_;
   scoped_refptr<SurfacesState> surfaces_state_;
 
   std::unique_ptr<DisplayCompositor> display_compositor_;
 
   // The region that needs to be redrawn next time the compositor frame is
   // generated.
   gfx::Rect dirty_rect_;
   base::Timer draw_timer_;
   bool frame_pending_ = false;
+  bool may_contain_video_ = false;
 
   base::WeakPtrFactory<FrameGenerator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameGenerator);
 };
 
 }  // namespace ws
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_FRAME_GENERATOR_H_