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

ash/wm/gestures/long_press_affordance_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/gestures/long_press_affordance_handler.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/shell.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell_window_ids.h"
@@ skipping 243 matching lines @@
   if (tap_down_touch_id_ != -1 && tap_down_touch_id_ != touch_id)
     return;
   int64 timer_start_time_ms =
       ui::GestureConfiguration::semi_long_press_time_in_seconds() * 1000;
   switch (event->type()) {
     case ui::ET_GESTURE_TAP_DOWN:
       // Start animation.
       tap_down_location_ = event->root_location();
       tap_down_touch_id_ = touch_id;
       current_animation_type_ = GROW_ANIMATION;
-      tap_down_display_id_ = gfx::Screen::GetDisplayNearestWindow(target).id();
+      tap_down_display_id_ =
+          Shell::GetAshScreen()->GetDisplayNearestWindow(target).id();
       timer_.Start(FROM_HERE,
                    base::TimeDelta::FromMilliseconds(timer_start_time_ms),
                    this,
                    &LongPressAffordanceHandler::StartAnimation);
       break;
     case ui::ET_TOUCH_MOVED:
       // If animation is running, We want it to be robust to small finger
       // movements. So we stop the animation only when the finger moves a
       // certain distance.
       if (!ui::gestures::IsInsideManhattanSquare(
@@ skipping 93 matching lines @@
     default:
       view_.reset();
       tap_down_touch_id_ = -1;
       tap_down_display_id_ = 0;
       break;
   }
 }
 
 }  // namespace internal
 }  // namespace ash