views: implement dialog width snapping

ui/views/views_delegate.cc

 // Copyright (c) 2013 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 "ui/views/views_delegate.h"
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ui/views/layout/layout_constants.h"
 #include "ui/views/views_touch_selection_controller_factory.h"
@@ skipping 137 matching lines @@
     case DistanceMetric::RELATED_BUTTON_HORIZONTAL:
       return kRelatedButtonHSpacing;
     case DistanceMetric::RELATED_CONTROL_HORIZONTAL:
       return kRelatedControlHorizontalSpacing;
     case DistanceMetric::RELATED_CONTROL_VERTICAL:
       return kRelatedControlVerticalSpacing;
     case DistanceMetric::DIALOG_BUTTON_MINIMUM_WIDTH:
       return kDialogMinimumButtonWidth;
     case DistanceMetric::BUTTON_HORIZONTAL_PADDING:
       return kButtonHorizontalPadding;
+    case DistanceMetric::DIALOG_WIDTH_SNAPPING_UNIT:
+      return 1;
   }
   NOTREACHED();
   return 0;
 }
 
 ViewsDelegate::ViewsDelegate()
     : views_tsc_factory_(new ViewsTouchEditingControllerFactory) {
   DCHECK(!views_delegate);
   views_delegate = this;
 
   ui::TouchEditingControllerFactory::SetInstance(views_tsc_factory_.get());
 
 #if defined(USE_AURA)
   touch_selection_menu_runner_.reset(new TouchSelectionMenuRunnerViews());
 #endif
 }
 
 }  // namespace views