content: Add DeletedGpuMemoryBuffer IPC.

content/common/gpu/client/gpu_memory_buffer_impl.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 CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/gpu_memory_buffer.h"
@@ skipping 17 matching lines @@
 
   // Allocates a GPU memory buffer with |size| and |internalformat| for |usage|
   // by |child_process|. The |handle| returned can be used by the
   // |child_process| to create an instance of this class.
   static void AllocateForChildProcess(const gfx::Size& size,
                                       unsigned internalformat,
                                       unsigned usage,
                                       base::ProcessHandle child_process,
                                       const AllocationCallback& callback);
 
+  // Notify that GPU memory buffer has been deleted by |child_process|.
+  static void DeletedByChildProcess(gfx::GpuMemoryBufferType type,
+                                    const gfx::GpuMemoryBufferId& id,
+                                    base::ProcessHandle child_process);
+
   // Creates an instance from the given |handle|. |size| and |internalformat|
   // should match what was used to allocate the |handle|.
   static scoped_ptr<GpuMemoryBufferImpl> CreateFromHandle(
-      gfx::GpuMemoryBufferHandle handle,
+      const gfx::GpuMemoryBufferHandle& handle,
       const gfx::Size& size,
       unsigned internalformat);
 
   // Returns true if |internalformat| is a format recognized by this base class.
   static bool IsFormatValid(unsigned internalformat);
 
   // Returns true if |usage| is recognized by this base class.
   static bool IsUsageValid(unsigned usage);
 
   // Returns the number of bytes per pixel that must be used by an
   // implementation when using |internalformat|.
   static size_t BytesPerPixel(unsigned internalformat);
 
   // Overridden from gfx::GpuMemoryBuffer:
   virtual bool IsMapped() const OVERRIDE;
 
  protected:
   GpuMemoryBufferImpl(const gfx::Size& size, unsigned internalformat);
 
   const gfx::Size size_;
   const unsigned internalformat_;
   bool mapped_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_