Only prelaunch the GPU process when accelerated compositor is not blacklisted.

content/browser/browser_main_loop.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.
 
 #include "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/hi_res_timer_manager.h"
@@ skipping 424 matching lines @@
   BrowserThreadsStarted();
 
   if (parts_.get())
     parts_->PreMainMessageLoopRun();
 
   // When running the GPU thread in-process, avoid optimistically starting it
   // since creating the GPU thread races against creation of the one-and-only
   // ChildProcess instance which is created by the renderer thread.
   GpuDataManager* gpu_data_manager = content::GpuDataManager::GetInstance();
   if (gpu_data_manager->GpuAccessAllowed() &&
+      (gpu_data_manager->GetGpuFeatureType() &
+          GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) == 0 &&
       !parsed_command_line_.HasSwitch(switches::kDisableGpuProcessPrelaunch) &&
       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process");
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE, base::Bind(
             base::IgnoreResult(&GpuProcessHost::Get),
             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
             content::CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
   }
@@ skipping 220 matching lines @@
   DCHECK_EQ(MessageLoop::TYPE_UI, MessageLoop::current()->type());
   if (parameters_.ui_task)
     MessageLoopForUI::current()->PostTask(FROM_HERE, *parameters_.ui_task);
 
   base::RunLoop run_loop;
   run_loop.Run();
 #endif
 }
 
 }  // namespace content