glBindTexImage2DCHROMIUM should retain pixel format.

ui/gl/gl_image_linux_dma_buffer.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 UI_GL_GL_IMAGE_LINUX_DMA_BUFFER_H_
 #define UI_GL_GL_IMAGE_LINUX_DMA_BUFFER_H_
 
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gl/gl_image_egl.h"
 
 namespace gfx {
 
 class GL_EXPORT GLImageLinuxDMABuffer : public GLImageEGL {
  public:
   GLImageLinuxDMABuffer(const Size& size, unsigned internalformat);
 
   // Returns true on success and the file descriptor can be closed as the
   // implementation will take a reference to the dma_buf.
   bool Initialize(const base::FileDescriptor& handle,
                   GpuMemoryBuffer::Format format,
                   int pitch);
 
+  // Overridden from GLImageEGL:

[reveman, 2015/05/12 15:27:19]

nit: "// Overridden from GLImage:" as I think these comments usually refer to
the interface the defined the function

+  unsigned GetFormat() override;
+
  protected:
   ~GLImageLinuxDMABuffer() override;
 
  private:
   unsigned internalformat_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageLinuxDMABuffer);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_LINUX_DMA_BUFFER_H_