Automatically start the GPU process 5s after 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/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/download/download_file_manager.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
+#include "content/browser/gpu/gpu_process_host.h"
 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/browser/in_process_webkit/webkit_thread.h"
 #include "content/browser/plugin_service_impl.h"
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 #include "content/browser/trace_controller.h"
 #include "content/common/hi_res_timer_manager.h"
 #include "content/common/sandbox_policy.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/browser/browser_shutdown.h"
 #include "content/public/browser/content_browser_client.h"
@@ skipping 392 matching lines @@
 #endif
 
   BrowserThreadsStarted();
 
   if (parts_.get())
     parts_->PreMainMessageLoopRun();
 
   // If the UI thread blocks, the whole UI is unresponsive.
   // Do not allow disk IO from the UI thread.
   base::ThreadRestrictions::SetIOAllowed(false);
+
+  BrowserThread::PostDelayedTask(
+      BrowserThread::IO, FROM_HERE, base::Bind(
+          base::IgnoreResult(&GpuProcessHost::GetForClient),
+          1,  // Arbitrary non-0 (to cause sandboxing) client_id.
+          content::CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP),
+      // Arbitrary delay to avoid allow browser init precious CPU cycles.
+      base::TimeDelta::FromSeconds(5));
 }
 
 void BrowserMainLoop::RunMainMessageLoopParts() {
   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 
   bool ran_main_loop = false;
   if (parts_.get())
     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 
   if (!ran_main_loop)
@@ skipping 186 matching lines @@
     MessageLoopForUI::current()->PostTask(FROM_HERE, *parameters_.ui_task);
 
 #if defined(OS_MACOSX)
   MessageLoopForUI::current()->Run();
 #else
   MessageLoopForUI::current()->RunWithDispatcher(NULL);
 #endif
 }
 
 }  // namespace content