Move chromeos specific code to ChromeBrowserMainPartsChromeos

chrome/browser/chrome_browser_main.h

Index: chrome/browser/chrome_browser_main.h
diff --git a/chrome/browser/chrome_browser_main.h b/chrome/browser/chrome_browser_main.h
index 26f22a66d1d57f064ae2dd423beadd38794b1948..93bf58f5dce76a4894bd2ecfef0c86588202147f 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -56,6 +56,9 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
       const content::MainFunctionParams& parameters);
 
   // content::BrowserMainParts overrides.
+  // These are called in-order by content::BrowserMainLoop.
+  // Each stage calls the same stages in any ChromeBrowserMainExtraParts added
+  // with AddParts() from ChromeContentBrowserClient::CreateBrowserMainParts.
   virtual void PreEarlyInitialization() OVERRIDE;
   virtual void PostEarlyInitialization() OVERRIDE;
   virtual void ToolkitInitialized() OVERRIDE;
@@ -71,6 +74,13 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   virtual void PostStopThread(content::BrowserThread::ID identifier) OVERRIDE;
   virtual void PostDestroyThreads() OVERRIDE;
 
+  // Additional stages for ChromeBrowserMainExtraParts. These stages are called
+  // in order from PreMainMessageLoopStart(). See implementation for details.
+  virtual void PreProfileInit();
+  virtual void PostProfileInit();
+  virtual void PreBrowserStart();
+  virtual void PostBrowserStart();
+
   // Displays a warning message that we can't find any locale data files.
   virtual void ShowMissingLocaleMessageBox() = 0;
 
@@ -82,6 +92,7 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   }
 
   Profile* profile() { return profile_; }
+  MetricsService* metrics() { return metrics_; }
 
  private:
   // Methods for |EarlyInitialization()| ---------------------------------------