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

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 0f355d78a751d0b02a0072b5dc8e89f095f0e52d..90f28f6fc9bcf19817f6f4fc543c47f5836ab2cd 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -278,7 +278,9 @@ class RenderMessageFilter : public BrowserMessageFilter {
                                  uint32 height,
                                  uint32 internalformat,
                                  uint32 usage,
-                                 gfx::GpuMemoryBufferHandle* handle);
+                                 IPC::Message* reply);
+  void SendAllocateGpuMemoryBufferReply(IPC::Message* reply,
+                                        gfx::GpuMemoryBufferHandle* handle);

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

Can we change this to:

void GpuMemoryBufferAllocated(
    IPC::Message* reply,
    const gfx::GpuMemoryBufferHandle& handle);

That way it would all line up nicely when moving it off the IO thread by adding
a AllocateGpuMemoryBufferOnUI/GpuMemoryBufferAllocatedOnUI pair of functions.
I'd like to do that as a follow up.

 
   // 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