Change glimage to accept a type.

content/common/gpu/client/gpu_memory_buffer_impl.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_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/size.h"
 
 namespace content {
 
 // Provides common implementation of a GPU memory buffer.
 class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
  public:
   static scoped_ptr<GpuMemoryBufferImpl> Create(
       gfx::GpuMemoryBufferHandle handle,
       gfx::Size size,
       unsigned internalformat);
 
   virtual ~GpuMemoryBufferImpl();
 
   static bool IsFormatValid(unsigned internalformat);
+  static bool IsUsageValid(unsigned usage);
   static size_t BytesPerPixel(unsigned internalformat);
 
   // Overridden from gfx::GpuMemoryBuffer:
   virtual bool IsMapped() const OVERRIDE;
   virtual uint32 GetStride() const OVERRIDE;
 
  protected:
   GpuMemoryBufferImpl(gfx::Size size, unsigned internalformat);
 
   const gfx::Size size_;
   unsigned internalformat_;
   bool mapped_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_