Add logic to GLRenderer to support RenderPassDrawQuad copying.

cc/output/software_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_SOFTWARE_RENDERER_H_
 #define CC_OUTPUT_SOFTWARE_RENDERER_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 88 matching lines @@
   gfx::Rect GetBackdropBoundingBoxForRenderPassQuad(
       const DrawingFrame* frame,
       const RenderPassDrawQuad* quad,
       const gfx::Transform& contents_device_transform) const;
   SkBitmap GetBackdropBitmap(const gfx::Rect& bounding_rect) const;
   sk_sp<SkShader> GetBackgroundFilterShader(
       const DrawingFrame* frame,
       const RenderPassDrawQuad* quad,
       SkShader::TileMode content_tile_mode) const;
 
+  // RenderPassDrawQuadCopier
+  bool CopyRenderPassDrawQuadToIOSurface(const RenderPassDrawQuad* quad,
+                                         ResourceId* resource_id) override;
+  void ReleaseIOSurfaces(const std::vector<ResourceId>& resources) override;
+  void UpdateCopyCountForFrame(size_t count) override;
+
   bool disable_picture_quad_image_filtering_ = false;
 
   RendererCapabilitiesImpl capabilities_;
   bool is_scissor_enabled_;
   bool is_backbuffer_discarded_;
   gfx::Rect scissor_rect_;
 
   SoftwareOutputDevice* output_device_;
   SkCanvas* root_canvas_;
   SkCanvas* current_canvas_;
   SkPaint current_paint_;
   std::unique_ptr<ResourceProvider::ScopedWriteLockSoftware>
       current_framebuffer_lock_;
   sk_sp<SkCanvas> current_framebuffer_canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(SoftwareRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SOFTWARE_RENDERER_H_