OverscrollGlow for mainThread-{BLINK CHANGES}

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 640748994f2cc102c31d19601cf721b0828302e2..07cd51412b75fa91b4bdf90feb659d52efbb84ad 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -727,14 +727,20 @@ bool WebViewImpl::handleGestureEvent(const WebGestureEvent& event)
         m_client->cancelScheduledContentIntents();
     case WebInputEvent::GestureScrollEnd:
     case WebInputEvent::GestureScrollUpdate:
-    case WebInputEvent::GestureFlingStart:
+    case WebInputEvent::GestureFlingStart: {
         // Scrolling-related gesture events invoke EventHandler recursively for each frame down
         // the chain, doing a single-frame hit-test per frame. This matches handleWheelEvent.
         // Perhaps we could simplify things by rewriting scroll handling to work inner frame
         // out, and then unify with other gesture events.
         eventSwallowed = mainFrameImpl()->frame()->eventHandler().handleGestureScrollEvent(platformEvent);
+        IntPoint unusedDelta = mainFrameImpl()->frame()->eventHandler().unusedDelta();
+        if (unusedDelta != IntPoint() && (event.type == WebInputEvent::GestureScrollUpdate)) {
+            IntPoint accumaltedRootOverScroll = mainFrameImpl()->frame()->eventHandler().accumaltedRootOverScroll();
+            m_client->didOverScrollOnMainThread(unusedDelta.x(), unusedDelta.y(), accumaltedRootOverScroll.x(), accumaltedRootOverScroll.y(), platformEvent.position().x(), platformEvent.position().y(), platformEvent.velocityX(), platformEvent.velocityY());
+        }

[majidvp, 2015/04/23 18:25:09]

Overscroll should be reported on both gesture and wheel scrolls.

         m_client->didHandleGestureEvent(event, eventCancelled);
         return eventSwallowed;
+    }
     case WebInputEvent::GesturePinchBegin:
     case WebInputEvent::GesturePinchEnd:
     case WebInputEvent::GesturePinchUpdate: