Add IPC to allow gpu process to send message for console back to renderer

content/renderer/gpu/command_buffer_proxy.h

Index: content/renderer/gpu/command_buffer_proxy.h
diff --git a/content/renderer/gpu/command_buffer_proxy.h b/content/renderer/gpu/command_buffer_proxy.h
index 65916212053cdf6150924da6cdf31e5b70394c32..c2f28b6605b4b8d5643e7c4e7e23ec77c0d9ce5d 100644
--- a/content/renderer/gpu/command_buffer_proxy.h
+++ b/content/renderer/gpu/command_buffer_proxy.h
@@ -22,6 +22,7 @@
 #include "ipc/ipc_message.h"
 
 class GpuChannelHost;
+struct GPUCommandBufferConsoleMessage;
 
 namespace base {
 class SharedMemory;
@@ -102,6 +103,7 @@ class CommandBufferProxy : public gpu::CommandBuffer,
   void OnNotifyRepaint();
   void OnDestroyed(gpu::error::ContextLostReason reason);
   void OnEchoAck();
+  void OnConsoleMessage(const GPUCommandBufferConsoleMessage& message);
 
   // Local cache of id to transfer buffer mapping.
   typedef std::map<int32, gpu::Buffer> TransferBufferMap;