Mac: Use GpuMemoryBuffers by default

content/browser/gpu/browser_gpu_memory_buffer_manager.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_GPU_BROWSER_GPU_MEMORY_BUFFER_MANAGER_H_
 #define CONTENT_BROWSER_GPU_BROWSER_GPU_MEMORY_BUFFER_MANAGER_H_
 
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 33 matching lines @@
   using CreateCallback =
       base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>;
   using AllocationCallback = CreateCallback;
 
   BrowserGpuMemoryBufferManager(int gpu_client_id,
                                 uint64_t gpu_client_tracing_id);
   ~BrowserGpuMemoryBufferManager() override;
 
   static BrowserGpuMemoryBufferManager* current();
 
+  static bool IsNativeGpuMemoryBuffersEnabled();
+
   static uint32 GetImageTextureTarget(gfx::BufferFormat format,
                                       gfx::BufferUsage usage);
 
   // Overridden from gpu::GpuMemoryBufferManager:
   scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) override;
   scoped_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBufferFromHandle(
       const gfx::GpuMemoryBufferHandle& handle,
@@ skipping 116 matching lines @@
   using BufferMap = base::hash_map<gfx::GpuMemoryBufferId, BufferInfo>;
   using ClientMap = base::hash_map<int, BufferMap>;
   ClientMap clients_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserGpuMemoryBufferManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_BROWSER_GPU_MEMORY_BUFFER_MANAGER_H_