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) { }
 protected:
     ~WebWidgetClient() { }
 };