Fix wheel event dispatch logic to fallback to document when hit-test fails

Source/core/paint/DeprecatedPaintLayer.cpp

Index: Source/core/paint/DeprecatedPaintLayer.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayer.cpp b/Source/core/paint/DeprecatedPaintLayer.cpp
index ab65b911838ce0184d324bcf406f3da45531eeb7..9c8eaa20c93c911771e086be04d5e8883fbe089d 100644
--- a/Source/core/paint/DeprecatedPaintLayer.cpp
+++ b/Source/core/paint/DeprecatedPaintLayer.cpp
@@ -1603,6 +1603,8 @@ bool DeprecatedPaintLayer::hitTest(const HitTestRequest& request, const HitTestL
         // exited the WebView, and so hit testing over a scrollbar hits the content document.
         // In addtion, it is possible for the mouse to stay in the document but there is no element.
         // At that time, the events of the mouse should be fired.
+        // TODO(majidvp): This should apply more consistently across different event types and we should not use

[Rick Byers, 2015/06/30 20:14:49]

nit: follow the wrapping of the rest of the comment (eg. about 100 characters
max).  No need for the extra space at the start of the next line.

[majidvp, 2015/06/30 22:48:32]

Done.

+        //                RequestType for it. Perhaps best for it to be done at a higher level. See http://crbug.com/505825
         LayoutPoint hitPoint = hitTestLocation.point();
         if (!request.isChildFrameHitTest() && ((request.active() || request.release()) || (request.move() && hitTestArea.contains(hitPoint.x(), hitPoint.y()))) && isRootLayer()) {
             layoutObject()->updateHitTestResult(result, toLayoutView(layoutObject())->flipForWritingMode(hitTestLocation.point()));