Mousemove event should be fired when the mouse stays in the document but there is no element.

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index bd3039f7000b9d7656b6c419d17ca277b8412423..83718f48b7560062f5374206650b625ea744f4b1 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -2400,7 +2400,10 @@ bool RenderLayer::hitTest(const HitTestRequest& request, const HitTestLocation&
         // We didn't hit any layer. If we are the root layer and the mouse is -- or just was -- down,
         // return ourselves. We do this so mouse events continue getting delivered after a drag has
         // exited the WebView, and so hit testing over a scrollbar hits the content document.
-        if (!request.isChildFrameHitTest() && (request.active() || request.release()) && isRootLayer()) {
+        // In addtion, the mouse is possible to stay in document but there is no element.

[Julien - ping for review, 2014/09/23 14:15:05]

I don't think we say "the mouse is possible to stay" but "it is possible for the
mouse to stay in the document".

[Miyoung Shin(g), 2014/09/24 01:34:15]

Thank you to disabuse.

+        // At that time, the events of the mouse should be fired.
+        LayoutPoint hitPoint = hitTestLocation.point();
+        if (!request.isChildFrameHitTest() && ((request.active() || request.release()) || (request.move() && hitTestArea.contains(hitPoint.x(), hitPoint.y()))) && isRootLayer()) {
             renderer()->updateHitTestResult(result, toRenderView(renderer())->flipForWritingMode(hitTestLocation.point()));
             insideLayer = this;
         }