Make gpu black list work again on Linux

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 732f0e257348f4ac8621dd4bfe2c5b75c3bb59f5..2d8b9180acec7cd84031d71788d1ebee593d28db 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -704,7 +704,7 @@ int BrowserMainLoop::PreCreateThreads() {
         "BrowserMainLoop::CreateThreads:PreCreateThreads");
     TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
 
-    result_code_ = parts_->PreCreateThreads();
+    result_code_ = parts_->PreCreateThreadsBegin();
   }
 
   // Initialize an instance of FeatureList. This will be a no-op if an instance
@@ -746,7 +746,7 @@ int BrowserMainLoop::PreCreateThreads() {
   // 1) Need to initialize in-process GpuDataManager before creating threads.
   // It's unsafe to append the gpu command line switches to the global
   // CommandLine::ForCurrentProcess object after threads are created.
-  // 2) Must be after parts_->PreCreateThreads to pick up chrome://flags.
+  // 2) Must be after parts_->PreCreateThreadsBegin to pick up chrome://flags.
   GpuDataManagerImpl::GetInstance()->Initialize();
 
 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
@@ -756,6 +756,11 @@ int BrowserMainLoop::PreCreateThreads() {
     RenderProcessHost::SetRunRendererInProcess(true);
 #endif
 
+  // parts may want to do some processing just before actually starting the
+  // threads.
+  if (parts_)
+    parts_->PreCreateThreadsEnd();
+
   return result_code_;
 }
 
@@ -1203,11 +1208,13 @@ int BrowserMainLoop::BrowserThreadsStarted() {
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 #elif defined(USE_AURA) || defined(OS_MACOSX)
   established_gpu_channel = true;
+  DVLOG(1) << "check and maybe start gpu process";
   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
     established_gpu_channel = always_uses_gpu = false;
   }
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
+  DVLOG(1) << "/check and maybe start gpu process";
   ImageTransportFactory::Initialize();
 #if defined(USE_AURA)
   bool use_mus_in_renderer = false;