Add multi-process GpuMemoryBuffer framework.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 446a53162884ef2f81fec22bedd807cb2b1a92a9..7bf1c56861e1646242baa61dab19e06cf7fb88bd 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -261,6 +261,9 @@ class RenderMessageFilter : public BrowserMessageFilter {
                             uint32_t data_size);
 #endif
 
+  void OnAllocateGpuMemoryBuffer(uint32 buffer_size,
+                                 base::SharedMemoryHandle* handle);
+
   // Cached resource request dispatcher host and plugin service, guaranteed to
   // be non-null if Init succeeds. We do not own the objects, they are managed
   // by the BrowserProcess, which has a wider scope than we do.