Added MojoCompositorFrameSink::EvictFrame() and MojoCompositorFrameSinkClient::WillDrawSurface()

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 <unordered_map>
 
@@ skipping 59 matching lines @@
   // CompositorFrame is submitted.
   void OnSurfaceCreated(const cc::SurfaceId& surface_id, ServerWindow* window);
 
  private:
   friend class ui::ws::test::FrameGeneratorTest;
 
   // cc::mojom::MojoCompositorFrameSinkClient implementation:
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& begin_frame_arags) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
+  void WillDrawSurface() override;
 
   // Generates the CompositorFrame.
   cc::CompositorFrame GenerateCompositorFrame(const gfx::Rect& output_rect);
 
   // 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);
@@ skipping 66 matching lines @@
   base::WeakPtrFactory<FrameGenerator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameGenerator);
 };
 
 }  // namespace ws
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_FRAME_GENERATOR_H_