Forward mouse down node information to WebWidgetClient

public/web/WebWidgetClient.h

Index: public/web/WebWidgetClient.h
diff --git a/public/web/WebWidgetClient.h b/public/web/WebWidgetClient.h
index 0d840ef291eefe2dd35316a7e2879c4cf70956d8..3affa4a6a49bf5899d9e2aaaac96bd14f2c071b8 100644
--- a/public/web/WebWidgetClient.h
+++ b/public/web/WebWidgetClient.h
@@ -165,6 +165,9 @@ public:
     // something as a result of a tap without explicitly consuming the event.
     virtual void showUnhandledTapUIIfNeeded(const WebPoint& tappedPosition,
         const WebNode& tappedNode, bool pageChanged) { }
+
+    // Called when there is mouse press or gesture tap event.
+    virtual void onClickInput(const WebNode& clickedNode) { }

[Rick Byers, 2015/06/18 17:02:10]

You've implemented this to be at mousedown time (and the node is the one that
received the mosuedown event) which isn't the same as "click" (or
"clickedNode").  Is that the behavior to want to match PageClickTracker?  If so,
please rename this to something like onMouseDown with a comment like: "Called
immediately after a mousedown event is dispatched due to a mouse press or
gesture tap event".

[Yufeng Shen (Slow to review), 2015/06/18 18:29:04]

Done.

 protected:
     ~WebWidgetClient() { }
 };