content: Always allocate GpuMemoryBuffers on UI thread.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 1749c5d7eef614bfadc525ee2e98a2eea4bc796d..89b7255c1e3e285e1de196113afa0dd7f4b17f49 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -22,6 +22,10 @@
 #include "ipc/ipc_platform_file.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 
+#if defined(OS_MACOSX)
+#include "base/mac/scoped_cftyperef.h"
+#endif
+
 struct ViewHostMsg_CompositorSurfaceBuffersSwapped_Params;
 
 namespace base {
@@ -31,6 +35,7 @@ class MessageLoop;
 
 namespace gfx {
 class Size;
+struct GpuMemoryBufferHandle;
 }
 
 namespace content {
@@ -317,6 +322,15 @@ class CONTENT_EXPORT RenderProcessHostImpl
   void SendDisableAecDumpToRenderer();
 #endif
 
+  // GpuMemoryBuffer allocation handler.
+  void OnAllocateGpuMemoryBuffer(uint32 width,
+                                 uint32 height,
+                                 uint32 internalformat,
+                                 uint32 usage,
+                                 IPC::Message* reply);
+  void GpuMemoryBufferAllocated(IPC::Message* reply,
+                                const gfx::GpuMemoryBufferHandle& handle);
+
   scoped_ptr<MojoApplicationHost> mojo_application_host_;
   bool mojo_activation_required_;
 
@@ -436,6 +450,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
 
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
+#if defined(OS_MACOSX)
+  base::ScopedCFTypeRef<CFTypeRef> last_io_surface_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };