Add multi-process GpuMemoryBuffer framework.

content/common/child_process_host_impl.cc

Index: content/common/child_process_host_impl.cc
diff --git a/content/common/child_process_host_impl.cc b/content/common/child_process_host_impl.cc
index fb058d3ea987c73acc45b120de38a34ce9fafb9e..4bd96b6c9b1885e7d943b565220594783c42d131 100644
--- a/content/common/child_process_host_impl.cc
+++ b/content/common/child_process_host_impl.cc
@@ -247,6 +247,8 @@ bool ChildProcessHostImpl::OnMessageReceived(const IPC::Message& msg) {
                           OnShutdownRequest)
       IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SyncAllocateSharedMemory,
                           OnAllocateSharedMemory)
+      IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer,
+                          OnAllocateGpuMemoryBuffer)
       IPC_MESSAGE_UNHANDLED(handled = false)
     IPC_END_MESSAGE_MAP()
 
@@ -293,4 +295,10 @@ void ChildProcessHostImpl::OnShutdownRequest() {
     Send(new ChildProcessMsg_Shutdown());
 }
 
+void ChildProcessHostImpl::OnAllocateGpuMemoryBuffer(
+    uint32 buffer_size,
+    base::SharedMemoryHandle* handle) {
+  AllocateSharedMemory(buffer_size, peer_handle_, handle);
+}
+
 }  // namespace content