Pass mouse events to the subframe as the other ports
by calling subframe handler.

Most of the time, nav cache found the iframe and calls
the correct eventhandler. But when nav cache fails,
we use the top frame and we need to pass the mouse
events to the subframe.

http://b/issue?id=2521087
diff --git a/WebCore/page/android/EventHandlerAndroid.cpp b/WebCore/page/android/EventHandlerAndroid.cpp
index 48f35c3..bdc5f2a 100644
--- a/WebCore/page/android/EventHandlerAndroid.cpp
+++ b/WebCore/page/android/EventHandlerAndroid.cpp
@@ -78,16 +78,6 @@
     return false;
 }
 
-// This function is called for mouse events by FrameView::handleMousePressEvent().
-// It is used to ensure that events are sync'ed correctly between frames. For example
-// if the user presses down in one frame and up in another frame, this function will
-// returns true, and pass the event to the correct frame.
-bool EventHandler::passSubframeEventToSubframe(MouseEventWithHitTestResults&, Frame*, HitTestResult*)
-{
-    notImplemented();
-    return false;
-}
-
 // This is called to route wheel events to child widgets when they are RenderWidget
 // as the parent usually gets wheel event. Don't have a mouse with a wheel to confirm
 // the operation of this function.
@@ -99,18 +89,21 @@
 
 bool EventHandler::passMousePressEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
 {
-    return passSubframeEventToSubframe(mev, subframe);
+    subframe->eventHandler()->handleMousePressEvent(mev.event());
+    return true;
 }
 
 bool EventHandler::passMouseMoveEventToSubframe(MouseEventWithHitTestResults& mev, 
-    Frame* subframe, HitTestResult*)
+    Frame* subframe, HitTestResult* hoveredNode)
 {
-    return passSubframeEventToSubframe(mev, subframe);
+    subframe->eventHandler()->handleMouseMoveEvent(mev.event(), hoveredNode);
+    return true;
 }
 
 bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
 {
-    return passSubframeEventToSubframe(mev, subframe);
+    subframe->eventHandler()->handleMouseReleaseEvent(mev.event());
+    return true;
 }
 
 class Clipboard : public RefCounted<Clipboard> {