Add context to gfx::Screen calls in support of simultaneous desktop+ash

ash/wm/maximize_bubble_controller.cc

Index: ash/wm/maximize_bubble_controller.cc
diff --git a/ash/wm/maximize_bubble_controller.cc b/ash/wm/maximize_bubble_controller.cc
index a08c7601b9fac76c5b59f2a08b0c14dd9f732316..1a30c64a4a0b28477e7fb9ca800db685f3cc225e 100644
--- a/ash/wm/maximize_bubble_controller.cc
+++ b/ash/wm/maximize_bubble_controller.cc
@@ -490,7 +490,8 @@ void MaximizeBubbleController::Bubble::MouseMovedOutOfHost() {
   // When we leave the bubble, we might be still be in gesture mode or over
   // the maximize button. So only close if none of the other cases apply.
   if (!owner_->frame_maximize_button()->is_snap_enabled()) {
-    gfx::Point screen_location = gfx::Screen::GetCursorScreenPoint();
+    gfx::Point screen_location = gfx::Screen::GetCursorScreenPoint(
+        ash::Shell::GetRootNativeView());
     if (!owner_->frame_maximize_button()->GetBoundsInScreen().Contains(
         screen_location)) {
         owner_->RequestDestructionThroughOwner();