PageLoadMetrics renderer and browser implementation.

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 49d0884de43256e204ad3159903db42e889d1af6..c60babaa9939a4f0861eb1c0f2b7d9d7597c755f 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -28,6 +28,11 @@ class CONTENT_EXPORT NavigationHandle {
   // Whether the navigation is taking place in the main frame or in a subframe.
   virtual bool IsInMainFrame() const = 0;
 
+  // Whether the navigation happened in the same page. This is only known
+  // after the navigation has committed. It is an error to call this method
+  // before the navigation has committed.
+  virtual bool IsSamePage() = 0;
+
   // Whether the navigation has successfully committed a document.
   virtual bool HasCommittedDocument() const = 0;