Add time-to-network histogram considering browser side navigation

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index af8e71ec151a6eb8f33b8e916dc8b3c380096fa3..feda9382f4ca2ca82fd47233cf4bdd8068d527f9 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
 #include "ui/base/window_open_disposition.h"
@@ -126,6 +127,12 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
   virtual void CommitNavigation(RenderFrameHostImpl* render_frame_host,
                                 const NavigationBeforeCommitInfo& info) {};
 
+  // PlzNavigate

[clamy, 2014/09/26 14:48:32]

nit: This not PlzNavigate specific, so I think you should remove this line.

[carlosk, 2014/09/26 15:50:25]

Done.

+  // Called when the first resource request for a given navigation is executed
+  // so that we can time it.

[clamy, 2014/09/26 14:48:32]

nit: Avoid using we in a comment.

[carlosk, 2014/09/26 15:50:25]

Done.

+  virtual void LogResourceRequestTime(
+    base::TimeTicks timestamp, const GURL& url) {};
+
  protected:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}