[page_load_metrics] Get navigation_start from NavigationHandle

content/browser/frame_host/navigation_handle_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/navigation_handle_impl.h"
 
 #include "base/command_line.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/navigator_delegate.h"
@@ skipping 81 matching lines @@
 }
 
 const GURL& NavigationHandleImpl::GetURL() {
   return url_;
 }
 
 bool NavigationHandleImpl::IsInMainFrame() {
   return frame_tree_node_->IsMainFrame();
 }
 
+const base::TimeTicks& NavigationHandleImpl::NavigationStart() {
+  return navigation_start_;
+}
+
 bool NavigationHandleImpl::IsPost() {
   CHECK_NE(INITIAL, state_)
       << "This accessor should not be called before the request is started.";
   return is_post_;
 }
 
 const Referrer& NavigationHandleImpl::GetReferrer() {
   CHECK_NE(INITIAL, state_)
       << "This accessor should not be called before the request is started.";
   return sanitized_referrer_;
@@ skipping 229 matching lines @@
       default:
         NOTREACHED();
     }
   }
   next_index_ = 0;
   state_ = WILL_REDIRECT_REQUEST;
   return NavigationThrottle::PROCEED;
 }
 
 }  // namespace content