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..a2f40d4d7b37704c742b6ee725a8aad2aa53776f 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 +295,11 @@ void ChildProcessHostImpl::OnShutdownRequest() {
     Send(new ChildProcessMsg_Shutdown());
 }
 
+void ChildProcessHostImpl::OnAllocateGpuMemoryBuffer(
+    uint32 buffer_size,
+    gfx::GpuMemoryBufferHandle* handle) {
+  handle->type = gfx::SHARED_MEMORY_BUFFER;
+  AllocateSharedMemory(buffer_size, peer_handle_, &handle->handle);
+}
+
 }  // namespace content