Allow switching DirectCompositionSurfaceWin between drawing modes.

cc/output/gl_renderer.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_OUTPUT_GL_RENDERER_H_
 #define CC_OUTPUT_GL_RENDERER_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 82 matching lines @@
   void DoDrawQuad(const class DrawQuad*,
                   const gfx::QuadF* draw_region) override;
   void BeginDrawingFrame() override;
   void FinishDrawingFrame() override;
   bool FlippedFramebuffer() const override;
   bool FlippedRootFramebuffer() const;
   void EnsureScissorTestEnabled() override;
   void EnsureScissorTestDisabled() override;
   void CopyCurrentRenderPassToBitmap(
       std::unique_ptr<CopyOutputRequest> request) override;
+  void SetEnableDCLayers(bool enable) override;
   void FinishDrawingQuadList() override;
 
   // Returns true if quad requires antialiasing and false otherwise.
   static bool ShouldAntialiasQuad(const gfx::QuadF& device_layer_quad,
                                   bool clipped,
                                   bool force_aa);
 
   // Inflate the quad and fill edge array for fragment shader.
   // |local_quad| is set to inflated quad. |edge| array is filled with
   // inflated quad's edge data.
@@ skipping 249 matching lines @@
   gfx::Size offscreen_stencil_renderbuffer_size_;
 
   base::WeakPtrFactory<GLRenderer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_GL_RENDERER_H_