Add support for compressed GPU memory buffers.

ui/gl/gl_image_memory.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_MEMORY_H_
 #define UI_GL_GL_IMAGE_MEMORY_H_
 
 #include "ui/gl/gl_image.h"
 
 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
@@ skipping 33 matching lines @@
                             OverlayTransform transform,
                             const Rect& bounds_rect,
                             const RectF& crop_rect) override;
 
  protected:
   ~GLImageMemory() override;
 
  private:
   void DoBindTexImage(unsigned target);
 
+  size_t MemoryBytes(gfx::GpuMemoryBuffer::Format format);
+
   const gfx::Size size_;
   const unsigned internalformat_;
   const unsigned char* memory_;
   gfx::GpuMemoryBuffer::Format format_;
   bool in_use_;
   unsigned target_;
   bool need_do_bind_tex_image_;
 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
     defined(USE_OZONE)
   unsigned egl_texture_id_;
   EGLImageKHR egl_image_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(GLImageMemory);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_MEMORY_H_