Send navigation_start to the browser in DidStartProvisionalLoad IPC

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index 3b2bbadda772a2f31a97b5faff489b0b730728c9..3f6b095bc1e39a0a7ad3d095fbb6cdf48a4549d8 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 
+#include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_throttle.h"
 #include "content/public/common/referrer.h"
@@ -39,6 +40,10 @@ class CONTENT_EXPORT NavigationHandle {
   // The WebContents the navigation is taking place in.
   WebContents* GetWebContents();
 
+  // The time the navigation started, recorded either in the renderer or browser
+  // process. Corresponds to Navigation Timing API Standard.
+  virtual const base::TimeTicks& GetNavigationStart() = 0;

[clamy, 2015/11/06 14:28:39]

The policy of the content public API forbids adding a method that is not used
outside of content/. Consider:
1) Adding code outside of content that use this.
or
2) Landing the method in NavigationHandleImpl and only making it public in the
CL that uses it outside of content/.

+
   // Parameters available at network request start time ------------------------
   //
   // The following parameters are only available when the network request is