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/sequenced_worker_pool.h"

[jam, 2012/03/01 06:13:02]

not needed?

[Ami GONE FROM CHROMIUM, 2012/03/01 16:03:59]

Done.

 #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.

[apatrick_chromium, 2012/03/01 00:26:21]

I had a plan at some point to have a pool of GPU processes but I think that will
never happen with the direction Aura is going. Not for this CL but GetForClient
should just take an argument indicating whether to return the sandboxed or
unsandboxed GPU process. I'll do it.

+          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