Add time-to-network histogram considering browser side navigation

content/browser/frame_host/navigator_impl.h

Index: content/browser/frame_host/navigator_impl.h
diff --git a/content/browser/frame_host/navigator_impl.h b/content/browser/frame_host/navigator_impl.h
index 2d87a5b7c3b5a63b2ba0d12733149f6cbdea7429..bf9551fff76719c1cf8aa5f016cfd66828bd4059 100644
--- a/content/browser/frame_host/navigator_impl.h
+++ b/content/browser/frame_host/navigator_impl.h
@@ -6,9 +6,11 @@
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/common/content_export.h"
+#include "url/gurl.h"
 
 struct FrameMsg_Navigate_Params;
 
@@ -78,6 +80,9 @@ class CONTENT_EXPORT NavigatorImpl : public Navigator {
       RenderFrameHostImpl* render_frame_host,
       const NavigationBeforeCommitInfo& info) OVERRIDE;
 
+  virtual void LogResourceRequestTime(
+      base::TimeTicks timestamp, const GURL& url) OVERRIDE;
+
  private:
   virtual ~NavigatorImpl() {}
 
@@ -104,6 +109,14 @@ class CONTENT_EXPORT NavigatorImpl : public Navigator {
   // events. Can be NULL in tests.
   NavigatorDelegate* delegate_;
 
+  // The time the latest navigation request started, used for a few histograms
+  // under the Navigation group.
+  base::TimeTicks navigation_start_time_;
+
+  // The URL of the navigation request to allow later matching when recording
+  // histogram data.
+  GURL navigation_start_url_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigatorImpl);
 };