Attach panel while dragging to bring it in front of other panels.

ash/wm/gestures/two_finger_drag_handler.cc

Index: ash/wm/gestures/two_finger_drag_handler.cc
diff --git a/ash/wm/gestures/two_finger_drag_handler.cc b/ash/wm/gestures/two_finger_drag_handler.cc
index 9decd47176b54725d20060d7e5fa72e86bbfb70d..6b0c457e2d1283076ec24a9ec419edbfce2d1cef 100644
--- a/ash/wm/gestures/two_finger_drag_handler.cc
+++ b/ash/wm/gestures/two_finger_drag_handler.cc
@@ -98,7 +98,9 @@ bool TwoFingerDragHandler::ProcessGestureEvent(aura::Window* target,
       if (WindowComponentsAllowMoving(first_finger_hittest_,
           target->delegate()->GetNonClientComponent(event.location()))) {
         target->AddObserver(this);
-        window_resizer_ = CreateWindowResizer(target,
+        // Pass NULL as the WindowResizerOwner as only this class knows how to
+        // handle drags with two finger gestures.
+        window_resizer_ = CreateWindowResizer(/* owner */ NULL, target,

[stevenjb, 2013/03/13 19:31:39]

NULL /* owner */

             event.details().bounding_box().CenterPoint(), HTCAPTION);
         return true;
       }