Only support left/right maximizing at 50% width when the --ash-enable-alternate-caption-button

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_properties.h"
 #include "ash/wm/window_resizer.h"
 #include "ash/wm/window_util.h"
-#include "ash/wm/workspace/snap_sizer.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/cursor/cursor.h"
@@ skipping 278 matching lines @@
           wm::MaximizeWindow(target);
         }
       } else if (wm::CanSnapWindow(target) &&
                  fabs(event->details().velocity_x()) >
                  kMinHorizVelocityForWindowSwipe) {
         // Snap left/right.
         ui::ScopedLayerAnimationSettings scoped_setter(
             target->layer()->GetAnimator());
         scoped_setter.SetPreemptionStrategy(
             ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
-        internal::SnapSizer::SnapWindow(target,
+        wm::SnapWindowToEdge(target,
             event->details().velocity_x() < 0 ?
-            internal::SnapSizer::LEFT_EDGE : internal::SnapSizer::RIGHT_EDGE);
+            wm::SNAP_LEFT_EDGE : wm::SNAP_RIGHT_EDGE);
       }
       break;
     }
     default:
       return;
   }
 
   event->StopPropagation();
 }
 
@@ skipping 200 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