Do not prelaunch GPU process at browser startup.

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 570 matching lines @@
 
 
 void BrowserMainLoop::BrowserThreadsStarted() {
   // RDH needs the IO thread to be created.
   resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
 
 #if defined(ENABLE_INPUT_SPEECH)
   speech_recognition_manager_.reset(new speech::SpeechRecognitionManagerImpl());
 #endif
 
-  // 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.
-  if (!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));
-  }
-
   // Start the GpuDataManager before we set up the MessageLoops because
   // otherwise we'll trigger the assertion about doing IO on the UI thread.
   content::GpuDataManager::GetInstance();
 }
 
 void BrowserMainLoop::InitializeToolkit() {
   // TODO(evan): this function is rather subtle, due to the variety
   // of intersecting ifdefs we have.  To keep it easy to follow, there
   // are no #else branches on any #ifs.
   // TODO(stevenjb): Move platform specific code into platform specific Parts
@@ skipping 40 matching lines @@
   MessageLoopForUI::current()->Run();
 #elif defined(OS_ANDROID)
   // Android's main message loop is the Java message loop.
   NOTREACHED();
 #else
   MessageLoopForUI::current()->RunWithDispatcher(NULL);
 #endif
 }
 
 }  // namespace content