ash: Refactor some code that snaps windows.

ash/wm/toplevel_window_event_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/toplevel_window_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/window_resizer.h"
@@ skipping 196 matching lines @@
       if (fabs(event->details().velocity_y()) >
           kMinVertVelocityForWindowMinimize) {
         // Minimize/maximize.
         if (event->details().velocity_y() > 0)
           wm::MinimizeWindow(target);
         else if (wm::CanMaximizeWindow(target))
           wm::MaximizeWindow(target);
       } else if (fabs(event->details().velocity_x()) >
                  kMinHorizVelocityForWindowSwipe) {
         // Snap left/right.
-        internal::SnapSizer sizer(target,
-            gfx::Point(),
-            event->details().velocity_x() < 0 ? internal::SnapSizer::LEFT_EDGE :
-            internal::SnapSizer::RIGHT_EDGE,
-            internal::SnapSizer::OTHER_INPUT);
-
         ui::ScopedLayerAnimationSettings scoped_setter(
             target->layer()->GetAnimator());
         scoped_setter.SetPreemptionStrategy(
             ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
-        target->SetBounds(sizer.target_bounds());
+        internal::SnapSizer::SnapWindow(target,
+            event->details().velocity_x() < 0 ?
+            internal::SnapSizer::LEFT_EDGE : internal::SnapSizer::RIGHT_EDGE);
       }
       break;
     }
     default:
       return ui::ER_UNHANDLED;
   }
 
   return ui::ER_CONSUMED;
 }
 
@@ skipping 196 matching lines @@
 void ToplevelWindowEventHandler::ResizerWindowDestroyed() {
   // We explicitly don't invoke RevertDrag() since that may do things to window.
   // Instead we destroy the resizer.
   window_resizer_.reset();
 
   // End the move loop. This does nothing if we're not in a move loop.
   EndMoveLoop();
 }
 
 }  // namespace ash