Delay the response to ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer via a callback to allow for b…

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"
 #include "ui/gfx/size.h"
 
 namespace content {
 
 // Provides common implementation of a GPU memory buffer.
 class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
  public:
   virtual ~GpuMemoryBufferImpl();
 
   // Creates a GPU memory buffer instance with |size| and |internalformat| for
   // |usage|.
   static scoped_ptr<GpuMemoryBufferImpl> Create(const gfx::Size& size,
                                                 unsigned internalformat,
                                                 unsigned usage);
 
   // 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,
-                                      gfx::GpuMemoryBufferHandle* handle);
+                                      gfx::GpuMemoryBufferHandle* handle,
+                                      const base::Closure& allocate_callback);

[reveman, 2014/05/19 05:51:07]

Instead of passing a heap allocated gfx::GpuMemoryBufferHandle to this function,
can make the callback:

typedef base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>
    AllocationCallback;

 
   // 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::Size& size,
       unsigned internalformat);
 
   // Returns true if |internalformat| is a format recognized by this base class.
   static bool IsFormatValid(unsigned internalformat);
@@ skipping 14 matching lines @@
   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_