cc: Partial draw without partial swap support.

content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.h

 // Copyright 2014 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 CONTENT_BROWSER_COMPOSITOR_GPU_SURFACELESS_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_GPU_SURFACELESS_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include <memory>
 
 #include "content/browser/compositor/gpu_browser_compositor_output_surface.h"
@@ skipping 29 matching lines @@
   void SwapBuffers(cc::OutputSurfaceFrame frame) override;
   void BindFramebuffer() override;
   uint32_t GetFramebufferCopyTextureFormat() override;
   void Reshape(const gfx::Size& size,
                float device_scale_factor,
                const gfx::ColorSpace& color_space,
                bool has_alpha,
                bool use_stencil) override;
   bool IsDisplayedAsOverlayPlane() const override;
   unsigned GetOverlayTextureId() const override;
+  bool CanPartialDraw(const gfx::Rect& damage) override;
 
   // BrowserCompositorOutputSurface implementation.
   void OnGpuSwapBuffersCompleted(
       const std::vector<ui::LatencyInfo>& latency_info,
       gfx::SwapResult result,
       const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac) override;
 
  private:
   gfx::Size reshape_size_;
   gfx::Size swap_size_;
 
   std::unique_ptr<display_compositor::GLHelper> gl_helper_;
   std::unique_ptr<display_compositor::BufferQueue> buffer_queue_;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_GPU_SURFACELESS_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_