Add switch (for cast_shell) to defer creation of GPU process.

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/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1051 matching lines @@
   }
 #endif
 
   if (initialize_gpu_data_manager)
     GpuDataManagerImpl::GetInstance()->Initialize();
 
   bool always_uses_gpu = true;
   bool established_gpu_channel = false;
 #if defined(USE_AURA) || defined(OS_MACOSX)
   established_gpu_channel = true;
-  if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
+  if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
+      parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
     established_gpu_channel = always_uses_gpu = false;
   }
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
   ImageTransportFactory::Initialize();
 #if defined(USE_AURA)
   if (aura::Env::GetInstance()) {
     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
   }
 #endif
 #elif defined(OS_ANDROID)
@@ skipping 191 matching lines @@
 
 void BrowserMainLoop::EndStartupTracing() {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content