ui: Add support for creating GLImage instances from shared memory pools.

ui/gl/gl_image_shared_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_SHARED_MEMORY_H_
 #define UI_GL_GL_IMAGE_SHARED_MEMORY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory_handle.h"
 #include "ui/gfx/generic_shared_memory_id.h"
 #include "ui/gl/gl_image_memory.h"
 
 namespace base {
 class SharedMemory;
 }
 
 namespace gfx {
 
 class GL_EXPORT GLImageSharedMemory : public GLImageMemory {
  public:
   GLImageSharedMemory(const Size& size, unsigned internalformat);
 
   bool Initialize(const base::SharedMemoryHandle& handle,
                   GenericSharedMemoryId shared_memory_id,
-                  BufferFormat format);
+                  BufferFormat format,
+                  size_t offset);
 
   // Overridden from GLImage:
   void Destroy(bool have_context) override;
   void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd,
                     uint64_t process_tracing_id,
                     const std::string& dump_name) override;
 
  protected:
   ~GLImageSharedMemory() override;
 
  private:
   scoped_ptr<base::SharedMemory> shared_memory_;
   GenericSharedMemoryId shared_memory_id_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageSharedMemory);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_SHARED_MEMORY_H_