Display skips swapping if overlays draw the damage

cc/output/direct_renderer.h

 // Copyright 2012 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_OUTPUT_DIRECT_RENDERER_H_
 #define CC_OUTPUT_DIRECT_RENDERER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
@@ skipping 14 matching lines @@
 // This is the base class for code shared between the GL and software
 // renderer implementations.  "Direct" refers to the fact that it does not
 // delegate rendering to another compositor.
 class CC_EXPORT DirectRenderer : public Renderer {
  public:
   ~DirectRenderer() override;
 
   void DecideRenderPassAllocationsForFrame(
       const RenderPassList& render_passes_in_draw_order) override;
   bool HasAllocatedResourcesForTesting(RenderPassId id) const override;
-  void DrawFrame(RenderPassList* render_passes_in_draw_order,
-                 float device_scale_factor,
-                 const gfx::Rect& device_viewport_rect,
-                 const gfx::Rect& device_clip_rect,
-                 bool disable_picture_quad_image_filtering) override;
+  DrawFrameResult DrawFrame(RenderPassList* render_passes_in_draw_order,
+                            float device_scale_factor,
+                            const gfx::Rect& device_viewport_rect,
+                            const gfx::Rect& device_clip_rect,
+                            bool disable_picture_quad_image_filtering) override;
 
   struct CC_EXPORT DrawingFrame {
     DrawingFrame();
     ~DrawingFrame();
 
     const RenderPassList* render_passes_in_draw_order;
     const RenderPass* root_render_pass;
     const RenderPass* current_render_pass;
     const ScopedResource* current_texture;
 
@@ skipping 109 matching lines @@
 
  private:
   gfx::Vector2d enlarge_pass_texture_amount_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_