Revert of Move gpu memory calculations to Compositor.

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 7843f2bdf5d557e16c643ee7383e36068c6b9fda..35ffd8e6f861a7c6094410f82e5d17e9b38e9ebd 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -625,6 +625,15 @@ IPC_MESSAGE_ROUTED2(GpuCommandBufferMsg_UpdateVSyncParameters,
 // Send to stub on surface visibility change.
 IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SetSurfaceVisible, bool /* visible */)
 
+// Sent to proxy when the gpu memory manager changes its memory allocation.
+IPC_MESSAGE_ROUTED1(GpuCommandBufferMsg_SetMemoryAllocation,
+                    gpu::MemoryAllocation /* allocation */)
+
+// Sent to stub when proxy is assigned a memory allocation changed callback.
+IPC_MESSAGE_ROUTED1(
+    GpuCommandBufferMsg_SetClientHasMemoryAllocationChangedCallback,
+    bool /* has_callback */)
+
 // Inserts a sync point into the channel. This is handled on the IO thread, so
 // can be expected to be reasonably fast, but the sync point is actually
 // retired in order with respect to the other calls. The sync point is shared