Set navigationStart correctly for all load types.

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index d8d94066207f125798398a30754cc574b75d11f5..2e5f3022a7af8c225209d30546ad61b39c35ff63 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -344,6 +344,12 @@ public:
     // The 'load' event was dispatched.
     virtual void didHandleOnloadEvents(WebLocalFrame*) { }
 
+    // The 'beforeunload' event was dispatched, a dialog probably was shown, and
+    // the navigation is not aborted.  |eventListenerCalled| is true if at least
+    // one frame (in the tree that is being closed) had a beforeunload event
+    // handler invoked.
+    virtual void didHandleOnBeforeUnloadEvent(bool eventListenerCalled) {}
+
     // The frame's document or one of its subresources failed to load. The
     // WebHistoryCommitType is the commit type that would have been used had the
     // load succeeded.