Add multi-process GpuMemoryBuffer framework.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index d7e32d080be9861eab46cb951eeeef986053410a..9c3c1d3b4335e9ae584b8cbae5f836de36db0115 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -398,6 +398,8 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message,
                         OnCheckNotificationPermission)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SyncAllocateSharedMemory,
                         OnAllocateSharedMemory)
+    IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer,
+                        OnAllocateGpuMemoryBuffer)
 #if defined(OS_POSIX) && !defined(TOOLKIT_GTK) && !defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(ViewHostMsg_AllocTransportDIB, OnAllocTransportDIB)
     IPC_MESSAGE_HANDLER(ViewHostMsg_FreeTransportDIB, OnFreeTransportDIB)
@@ -1165,4 +1167,12 @@ void RenderMessageFilter::OnWebAudioMediaCodec(
       true);
 }
 #endif
+
+void RenderMessageFilter::OnAllocateGpuMemoryBuffer(
+    uint32 buffer_size,
+    base::SharedMemoryHandle* handle) {
+  ChildProcessHostImpl::AllocateSharedMemory(
+      buffer_size, PeerHandle(), handle);

[piman, 2013/10/21 21:57:00]

nit: the intention here is to do more than this, otherwise there's no
justification for the new IPC. Add a TODO to explain the plan here and/or that
it's work in progress?

[reveman, 2013/10/22 16:26:11]

Done. I also changed it to return a gfx::GpuMemoryBufferHandle as that's what we
need in the future and I think it makes the purpose of this new IPC more clear.

+}
+
 }  // namespace content