Schedule cursor update when DOM updates layout.

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 77af681885b1f70c236bc486fe9e733a5ce68ab0..3b03e677a47c3609cc00f97e0d0cc494f799206f 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -1889,6 +1889,9 @@ void Document::updateLayout()
 
     updateRenderTreeIfNeeded();
 
+    if (LocalFrame* frame = this->frame())
+        frame->eventHandler().scheduleCursorUpdate();

[Rick Byers, 2015/02/12 00:07:13]

This is a good start.  I think this could trigger to aggressively though - eg.
if frameView->needsLayout is false then we probably don't want to schedule an
update.  The idea here is that we need to update the cursor only if layout
actually changed (not just if something thinks they need to check to see if
layout should be updated).

Digging down through this code, it looks like  FrameView::performPostLayoutTasks
(which gets invoked from the frameView->layout call below) is probably a better
place.

+
     if (!isActive())
         return;