gpu: Refactor GpuMemoryBuffer framework for multi-process support.

gpu/command_buffer/common/command_buffer.h

 // Copyright (c) 2012 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 GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 #define GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 
 #include "gpu/command_buffer/common/buffer.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/gpu_export.h"
 
 namespace base {
 class SharedMemory;
 }
 
+namespace gfx {
+class GpuMemoryBuffer;
+}
+
 namespace gpu {
 
 // Common interface for CommandBuffer implementations.
 class GPU_EXPORT CommandBuffer {
  public:
   struct State {
     State()
         : num_entries(0),
           get_offset(0),
           put_offset(0),
@@ skipping 108 matching lines @@
   // RendererGLContext::MakeCurrent prior to every GL call. It saves returning 6
   // ints redundantly when only the error is needed for the CommandBufferProxy
   // implementation.
   virtual error::Error GetLastError();
 #endif
 
   // Inserts a sync point, returning its ID. Sync point IDs are global and can
   // be used for cross-context synchronization.
   virtual uint32 InsertSyncPoint() = 0;
 
+  // Create a gpu memory buffer of the given dimensions and format. Returns
+  // its ID or -1 on error.
+  virtual gfx::GpuMemoryBuffer* CreateGpuMemoryBuffer(
+      size_t width,
+      size_t height,
+      unsigned internalformat,
+      int32* id) = 0;
+
+  // Destroy a gpu memory buffer. The ID must be positive.
+  virtual void DestroyGpuMemoryBuffer(int32 id) = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(CommandBuffer);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_