(DEPRECATED) Send navigation_start to browser process in DidStartProvisionalLoad

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index 6f46707108e531ceac132639638d387611e5710f..35d53a2184a52ad9636d9e303fb748ebed39354d 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -59,12 +59,14 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
  public:
   static scoped_ptr<NavigationHandleImpl> Create(
       const GURL& url,
-      FrameTreeNode* frame_tree_node);
+      FrameTreeNode* frame_tree_node,
+      double navigation_start);
   ~NavigationHandleImpl() override;
 
   // NavigationHandle implementation:
   const GURL& GetURL() override;
   bool IsInMainFrame() override;
+  double GetNavigationStart() override;
   bool IsPost() override;
   const Referrer& GetReferrer() override;
   bool HasUserGesture() override;
@@ -161,8 +163,13 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
     DID_COMMIT_ERROR_PAGE,
   };
 
+  // |navigation_start| comes from the DidStartProvisionalLoad IPC, which tracks
+  // both renderer-initiated and browser-initiated navigation start.
+  // PlzNavigate: Renderer-initated navigations send this with a BeginNavigation
+  // IPC. Browser-initiated navigations set it at the call-site.
   NavigationHandleImpl(const GURL& url,
-                       FrameTreeNode* frame_tree_node);
+                       FrameTreeNode* frame_tree_node,
+                       double navigation_start);
 
   NavigationThrottle::ThrottleCheckResult CheckWillStartRequest();
   NavigationThrottle::ThrottleCheckResult CheckWillRedirectRequest();
@@ -197,6 +204,9 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // The index of the next throttle to check.
   size_t next_index_;
 
+  // The time this navigation started.
+  double navigation_start_;

[clamy, 2015/10/28 12:40:01]

This should be a base::TimeTicks or a base::Time (preferably base::TimeTicks).

+
   // This callback will be run when all throttle checks have been performed.
   ThrottleChecksFinishedCallback complete_callback_;