content: Cleanup GpuMemoryBuffer allocation.

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.h

 // Copyright 2013 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_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_IO_SURFACE_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_IO_SURFACE_H_
 
 #include "base/mac/scoped_cftyperef.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 class IOSurfaceSupport;
 
 namespace content {
 
-// Provides implementation of a GPU memory buffer based
-// on an IO surface handle.
+// Implementation of GPU memory buffer based on IO surfaces.
 class GpuMemoryBufferImplIOSurface : public GpuMemoryBufferImpl {
  public:
-  GpuMemoryBufferImplIOSurface(gfx::Size size, unsigned internalformat);
+  GpuMemoryBufferImplIOSurface(const gfx::Size& size, unsigned internalformat);
   virtual ~GpuMemoryBufferImplIOSurface();
 
   static bool IsFormatSupported(unsigned internalformat);
   static bool IsUsageSupported(unsigned usage);
+  static bool IsConfigurationSupported(unsigned internalformat, unsigned usage);
   static uint32 PixelFormat(unsigned internalformat);
 
-  bool Initialize(gfx::GpuMemoryBufferHandle handle);
+  bool InitializeFromHandle(gfx::GpuMemoryBufferHandle handle);
 
   // Overridden from gfx::GpuMemoryBuffer:
   virtual void* Map() OVERRIDE;
   virtual void Unmap() OVERRIDE;
   virtual uint32 GetStride() const OVERRIDE;
   virtual gfx::GpuMemoryBufferHandle GetHandle() const OVERRIDE;
 
  private:
   IOSurfaceSupport* io_surface_support_;
   base::ScopedCFTypeRef<CFTypeRef> io_surface_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplIOSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_IO_SURFACE_H_