Execute all GL commands up to the put offset reported by a flush.

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
===================================================================
--- content/common/gpu/gpu_messages.h	(revision 92876)
+++ content/common/gpu/gpu_messages.h	(working copy)
@@ -300,7 +300,6 @@
 // The CommandBufferProxy sends this to the GpuCommandBufferStub in its
 // destructor, so that the stub deletes the actual CommandBufferService
 // object that it's hosting.
-// TODO(apatrick): Implement this.
 IPC_SYNC_MESSAGE_CONTROL1_0(GpuChannelMsg_DestroyCommandBuffer,
                             int32 /* instance_id */)
 
@@ -356,6 +355,12 @@
                     int32 /* put_offset */,
                     uint32 /* flush_count */)
 
+// Asynchronously process any commands known to the GPU process. This is only
+// used in the event that a channel is unscheduled and needs to be flushed
+// again to process any commands issued subsequent to unscheduling. The GPU
+// process actually sends it (deferred) to itself.
+IPC_MESSAGE_ROUTED0(GpuCommandBufferMsg_Rescheduled)
+
 // Return the current state of the command buffer following a request via
 // an AsyncGetState or AsyncFlush message. (This message is sent from the
 // GPU process to the renderer process.)