Make in-process gpu init thread safe

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 4a87f872a6e88226b2c0122fa2e6d27e1a3df85e..661c1c56d9cb877b74c421e5c41f3ff100881613 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -150,6 +150,9 @@ class CONTENT_EXPORT BrowserMainLoop {
   void InitStartupTracing(const base::CommandLine& command_line);
   void EndStartupTracing();
 
+  bool UsingInProcessGpu() const;
+  void InitializeGpuDataManager();
+
   // Members initialized on construction ---------------------------------------
   const MainFunctionParams& parameters_;
   const base::CommandLine& parsed_command_line_;