Only add rescheduled message when there are commands to reschedule.

content/common/gpu/gpu_channel.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "content/common/gpu/gpu_channel.h"
 
@@ skipping 242 matching lines @@
         IPC::Message* reply = IPC::SyncMessage::GenerateReply(&*message);
         reply->set_reply_error();
         Send(reply);
       }
     } else {
       // If the channel becomes unscheduled as a result of handling the message
       // or has more work to do, synthesize an IPC message to flush the command
       // buffer that became unscheduled.
       GpuCommandBufferStub* stub = stubs_.Lookup(message->routing_id());
       if (stub) {
-        if (!stub->IsScheduled() || stub->HasMoreWork()) {
+        if (stub->HasUnprocessedCommands() || stub->HasMoreWork()) {
           deferred_messages_.push_front(new GpuCommandBufferMsg_Rescheduled(
               stub->route_id()));
         }
         if (stub->HasMoreWork() && !handle_messages_scheduled_) {
           MessageLoop::current()->PostDelayedTask(
               FROM_HERE,
               base::Bind(&GpuChannel::HandleMessage,
                          weak_factory_.GetWeakPtr()),
               base::TimeDelta::FromMilliseconds(kHandleMoreWorkPeriodMs));
           handle_messages_scheduled_ = true;
@@ skipping 157 matching lines @@
 
 #if defined(OS_POSIX)
 int GpuChannel::TakeRendererFileDescriptor() {
   if (!channel_.get()) {
     NOTREACHED();
     return -1;
   }
   return channel_->TakeClientFileDescriptor();
 }
 #endif  // defined(OS_POSIX)