cc: one copy is default as well as final fallback.

content/renderer/render_thread_impl.h

 // Copyright (c) 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 CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 174 matching lines @@
   base::WaitableEvent* GetShutdownEvent() override;
   ServiceRegistry* GetServiceRegistry() override;
 
   // CompositorDependencies implementation.
   bool IsGpuRasterizationForced() override;
   bool IsGpuRasterizationEnabled() override;
   int GetGpuRasterizationMSAASampleCount() override;
   bool IsLcdTextEnabled() override;
   bool IsDistanceFieldTextEnabled() override;
   bool IsZeroCopyEnabled() override;
-  bool IsOneCopyEnabled() override;
   bool IsElasticOverscrollEnabled() override;
   uint32 GetImageTextureTarget() override;
   scoped_refptr<base::SingleThreadTaskRunner>
   GetCompositorMainThreadTaskRunner() override;
   scoped_refptr<base::SingleThreadTaskRunner>
   GetCompositorImplThreadTaskRunner() override;
   gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
   scheduler::RendererScheduler* GetRendererScheduler() override;
   cc::ContextProvider* GetSharedMainThreadContextProvider() override;
   scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
@@ skipping 397 matching lines @@
 
   scoped_refptr<ResourceSchedulingFilter> resource_scheduling_filter_;
 
   // Compositor settings.
   bool is_gpu_rasterization_enabled_;
   bool is_gpu_rasterization_forced_;
   int gpu_rasterization_msaa_sample_count_;
   bool is_lcd_text_enabled_;
   bool is_distance_field_text_enabled_;
   bool is_zero_copy_enabled_;
-  bool is_one_copy_enabled_;
   bool is_elastic_overscroll_enabled_;
   unsigned use_image_texture_target_;
   bool is_gather_pixel_refs_enabled_;
 
   class PendingRenderFrameConnect
       : public base::RefCounted<PendingRenderFrameConnect> {
    public:
     PendingRenderFrameConnect(
         int routing_id,
         mojo::InterfaceRequest<mojo::ServiceProvider> services,
@@ skipping 25 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_