Windows docking should get triggered by pressing against the screen edge

ash/wm/drag_window_resizer.cc

Index: ash/wm/drag_window_resizer.cc
diff --git a/ash/wm/drag_window_resizer.cc b/ash/wm/drag_window_resizer.cc
index e8f977e6418ba041b27c87755a4298423c8a84e4..ec26d3b4299036aef74867bc10bdf25bd4c0572a 100644
--- a/ash/wm/drag_window_resizer.cc
+++ b/ash/wm/drag_window_resizer.cc
@@ -110,8 +110,9 @@ void DragWindowResizer::CompleteDrag(int event_flags) {
                            &last_mouse_location_in_screen);
   gfx::Screen* screen = Shell::GetScreen();
   const gfx::Display dst_display =
-      screen->GetDisplayNearestPoint(last_mouse_location_in_screen);
-
+      ScreenAsh::FindDisplayContainingPoint(last_mouse_location_in_screen);
+  if (!dst_display.is_valid())

[flackr, 2013/09/06 02:18:43]

What happens in this case? If the drag crossed into another monitor and then
went outside the display (not sure when this happens) wouldn't that leave the
window parented to the first display but in the second monitor's bounds?

[varkha, 2013/09/09 15:38:42]

I think this only happens when you don't --ash-constrain-pointer-to-root. The
window dragged from the right screen to the left and beyond was disappearing.
This was bothering me during development but I left this out of this CL for now.
The alternative as you point out correctly is not much better.

+    return;
   if (dst_display.id() !=
       screen->GetDisplayNearestWindow(GetTarget()->GetRootWindow()).id()) {
     const gfx::Rect dst_bounds =