Enable sync allocation of GpuMemoryBuffers from the browser process.

content/common/gpu/client/gpu_memory_buffer_impl.h

Index: content/common/gpu/client/gpu_memory_buffer_impl.h
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl.h b/content/common/gpu/client/gpu_memory_buffer_impl.h
index e3323f0fed72148f3ab77e984fc67eccfa130307..312e2e2c38a6c3404920c8496131d8f0b2b5dba5 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl.h
+++ b/content/common/gpu/client/gpu_memory_buffer_impl.h
@@ -17,14 +17,17 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
  public:
   typedef base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>
       AllocationCallback;
+  typedef base::Callback<void(scoped_ptr<GpuMemoryBufferImpl> buffer)>
+      CreationCallback;

[reveman, 2014/09/09 17:18:26]

nit: sort these typedefs in the order they are used below. Creation before
Allocation.

[alexst (slow to review), 2014/09/09 21:53:57]

Done.

 
   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);
+  static void Create(const gfx::Size& size,
+                     unsigned internalformat,
+                     unsigned usage,
+                     const CreationCallback& callback);
 
   // Allocates a GPU memory buffer with |size| and |internalformat| for |usage|
   // by |child_process| identified by |child_id|. The |handle| returned can be