Run the later parts of startup as UI thread tasks

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 0f3d3d711091cc463fcf7d1e3d1ddfc62b19b6ac..1f15c87753a62b7a48df008370e15c92ff0e2df8 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -6,8 +6,10 @@
 #define CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_
 
 #include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/browser_process_sub_thread.h"
+#include "content/public/common/startup_task_runner.h"
 
 class CommandLine;
 
@@ -63,7 +65,7 @@ class CONTENT_EXPORT BrowserMainLoop {
   void MainMessageLoopStart();
 
   // Create all secondary threads.
-  void CreateThreads();
+  void CreateThreads(const scoped_refptr<StartupTaskRunner>& task_runner);
 
   // Perform the default message loop run logic.
   void RunMainMessageLoopParts();
@@ -91,9 +93,17 @@ class CONTENT_EXPORT BrowserMainLoop {
 
   void InitializeMainThread();
 
+  // Called just before creating the threads
+  void PreCreateThreads();
+
+  // Create a single thread.
+  void CreateThread(size_t thread_id);
+
   // Called right after the browser threads have been started.
   void BrowserThreadsStarted();
 
+  void PreMainMessageLoopRun();
+
   void MainMessageLoopRun();
 
   // Members initialized on construction ---------------------------------------