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

ui/gfx/gpu_memory_buffer.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 UI_GFX_GPU_MEMORY_BUFFER_H_
 #define UI_GFX_GPU_MEMORY_BUFFER_H_
 
 #include "base/memory/shared_memory.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "build/build_config.h"
@@ skipping 20 matching lines @@
 };
 
 using GpuMemoryBufferId = GenericSharedMemoryId;
 
 struct GFX_EXPORT GpuMemoryBufferHandle {
   GpuMemoryBufferHandle();
   bool is_null() const { return type == EMPTY_BUFFER; }
   GpuMemoryBufferType type;
   GpuMemoryBufferId id;
   base::SharedMemoryHandle handle;
+  uint32_t offset;
 #if defined(USE_OZONE)
   NativePixmapHandle native_pixmap_handle;
 #endif
 };
 
 base::trace_event::MemoryAllocatorDumpGuid GFX_EXPORT
 GetGpuMemoryBufferGUIDForTracing(uint64 tracing_process_id,
                                  GpuMemoryBufferId buffer_id);
 
 // This interface typically correspond to a type of shared memory that is also
@@ skipping 33 matching lines @@
   // Returns a platform specific handle for this buffer.
   virtual GpuMemoryBufferHandle GetHandle() const = 0;
 
   // Type-checking downcast routine.
   virtual ClientBuffer AsClientBuffer() = 0;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GPU_MEMORY_BUFFER_H_