(not for commit) Simplified multi-threaded Ganesh with lock on Flush only.

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1108 matching lines @@
         // IOSurface backed images require GL_TEXTURE_RECTANGLE_ARB.
         command_line->AppendSwitchASCII(
             switches::kUseImageTextureTarget,
             gpu::gles2::GLES2Util::GetStringEnum(GL_TEXTURE_RECTANGLE_ARB));
         break;
       default:
         break;
     }
   }
 
-  if (IsTilePrepareEnabled())
-    command_line->AppendSwitch(switches::kEnableTilePrepare);
+  if (IsThreadedGpuRasterizationEnabled())
+    command_line->AppendSwitch(switches::kEnableThreadedGpuRasterization);
 
   // Appending disable-gpu-feature switches due to software rendering list.
   GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();
   DCHECK(gpu_data_manager);
   gpu_data_manager->AppendRendererCommandLine(command_line);
 }
 
 void RenderProcessHostImpl::AppendRendererCommandLine(
     base::CommandLine* command_line) const {
   // Pass the process type first, so it shows first in process listings.
@@ skipping 1250 matching lines @@
 
 void RenderProcessHostImpl::DecrementWorkerRefCount() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK_GT(worker_ref_count_, 0);
   --worker_ref_count_;
   if (worker_ref_count_ == 0)
     Cleanup();
 }
 
 }  // namespace content