Don't force layout for mouse event hit tests

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 3be45408feba27f733a3d37ddd47bf290919db05..403b2acb03fffd927725930caada5a89290aced7 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2796,7 +2796,7 @@ MouseEventWithHitTestResults Document::prepareMouseEvent(const HitTestRequest& r
 {
     ASSERT(!renderer() || renderer()->isRenderView());
 
-    if (!renderer())
+    if (!renderer() || !shouldScheduleLayout())

[eseidel, 2013/05/14 00:35:03]

What if I have a renderer, but I don't need a layout?

[cbiesinger, 2013/05/14 00:46:57]

I think my/ojan's previous comments addressed this question, but maybe I
misunderstood.

That said, ojan wants me to check for everHadLayout instead, which I'm happy to
switch to.

         return MouseEventWithHitTestResults(event, HitTestResult(LayoutPoint()));
 
     HitTestResult result(documentPoint);