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

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
diff --git a/content/common/gpu/gpu_messages.h b/content/common/gpu/gpu_messages.h
index 7099747750884b97b12c6d84266bf115c1d1ff7f..bc01c6160e15dd73ee494f36124640ddb994caaa 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -82,6 +82,11 @@ IPC_STRUCT_BEGIN(GpuHostMsg_AcceleratedSurfaceRelease_Params)
 #endif
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(GPUCommandBufferConsoleMessage)
+  IPC_STRUCT_MEMBER(int32, id)
+  IPC_STRUCT_MEMBER(std::string, message)
+IPC_STRUCT_END()
+
 IPC_STRUCT_TRAITS_BEGIN(content::DxDiagNode)
   IPC_STRUCT_TRAITS_MEMBER(values)
   IPC_STRUCT_TRAITS_MEMBER(children)
@@ -352,6 +357,10 @@ IPC_MESSAGE_ROUTED0(GpuCommandBufferMsg_Rescheduled)
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_UpdateState,
                     gpu::CommandBuffer::State /* state */)
 
+// Sent by the GPU process to display messages in the console.
+IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_ConsoleMsg,
+                    GPUCommandBufferConsoleMessage /* msg */)
+
 // Create a shared memory transfer buffer. Returns an id that can be used to
 // identify the transfer buffer from a comment.
 IPC_SYNC_MESSAGE_ROUTED2_1(GpuCommandBufferMsg_CreateTransferBuffer,