Disabled GPU process prelaunch field trial.

This might be causing the GPU to hang even when not viewing GPU hardware accelerated content. An example appears to be the ATI HD2600 on mac.

TEST=try
BUG=none

Review URL: http://codereview.chromium.org/6380001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71737 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/renderer_host/browser_render_process_host.cc

@@ -722,7 +722,6 @@ void BrowserRenderProcessHost::PropagateBrowserCommandLineToRenderer(
     switches::kEnableRemoting,
     switches::kEnableClickToPlay,
     switches::kEnableResourceContentSettings,
-    switches::kPrelaunchGpuProcess,
     switches::kEnableAcceleratedDecoding,
     switches::kDisableFileSystem,
     switches::kPpapiOutOfProcess,

chrome/common/chrome_switches.cc

@@ -932,10 +932,6 @@ const char kPpapiPluginProcess[]            = "ppapi";
 // Causes the PPAPI sub process to display a dialog on launch.
 const char kPpapiStartupDialog[]            = "ppapi-startup-dialog";
 
-// Establishes a channel to the GPU process asynchronously and (re)launches it
-// if necessary when a renderer process starts.
-const char kPrelaunchGpuProcess[]           = "prelaunch-gpu-process";
-
 // Prints the pages on the screen.
 const char kPrint[]                         = "print";
 

chrome/common/chrome_switches.h

@@ -267,7 +267,6 @@ extern const char kPpapiOutOfProcess[];
 extern const char kPpapiPluginLauncher[];
 extern const char kPpapiPluginProcess[];
 extern const char kPpapiStartupDialog[];
-extern const char kPrelaunchGpuProcess[];
 extern const char kPrint[];
 extern const char kProcessPerSite[];
 extern const char kProcessPerTab[];

chrome/renderer/render_thread.cc

@@ -127,9 +127,6 @@ static const double kInitialIdleHandlerDelayS = 1.0 /* seconds */;
 static const double kInitialExtensionIdleHandlerDelayS = 5.0 /* seconds */;
 static const int64 kMaxExtensionIdleHandlerDelayS = 5*60 /* seconds */;
 
-static const int kPrelauchGpuPercentage = 5;
-static const int kPrelauchGpuProcessDelayMS = 10000;
-
 // Keep the global RenderThread in a TLS slot so it is impossible to access
 // incorrectly from the wrong thread.
 static base::LazyInstance<base::ThreadLocalPointer<RenderThread> > lazy_tls(
@@ -301,23 +298,6 @@ void RenderThread::Init() {
   AddFilter(suicide_on_channel_error_filter_.get());
 #endif
 
-  // Establish a channel to the GPU process asynchronously if requested. If the
-  // channel is established in time, EstablishGpuChannelSync will not block when
-  // it is later called. Delays by a fixed period of time to avoid loading the
-  // GPU immediately in an attempt to not slow startup time.
-  scoped_refptr<base::FieldTrial> prelaunch_trial(
-      new base::FieldTrial("PrelaunchGpuProcessExperiment", 100));
-  int prelaunch_group = prelaunch_trial->AppendGroup("prelaunch_gpu_process",
-                                                     kPrelauchGpuPercentage);
-  if (prelaunch_group == prelaunch_trial->group() ||
-      CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kPrelaunchGpuProcess)) {
-    message_loop()->PostDelayedTask(FROM_HERE,
-                                    task_factory_->NewRunnableMethod(
-                                        &RenderThread::EstablishGpuChannel),
-                                    kPrelauchGpuProcessDelayMS);
-  }
-
   TRACE_EVENT_END("RenderThread::Init", 0, "");
 }