views: implement dialog width snapping

chrome/browser/ui/views/harmony/layout_delegate.cc

 // Copyright 2016 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 "chrome/browser/ui/views/harmony/layout_delegate.h"
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "chrome/browser/ui/views/chrome_views_delegate.h"
 #include "chrome/browser/ui/views/harmony/harmony_layout_delegate.h"
@@ skipping 22 matching lines @@
     case Metric::DIALOG_BUTTON_MARGIN:
       return views::kButtonHEdgeMarginNew;
     case Metric::DIALOG_BUTTON_MINIMUM_WIDTH:
       return ChromeViewsDelegate::GetInstance()->GetDefaultDistanceMetric(
           views::DistanceMetric::DIALOG_BUTTON_MINIMUM_WIDTH);
     case Metric::DIALOG_BUTTON_TOP_SPACING:
       return 0;
     case Metric::DIALOG_CLOSE_BUTTON_MARGIN:
       return ChromeViewsDelegate::GetInstance()->GetDefaultDistanceMetric(
           views::DistanceMetric::CLOSE_BUTTON_MARGIN);
+    case Metric::DIALOG_WIDTH_SNAPPING_UNIT:
+      return 1;
     case Metric::PANEL_CONTENT_MARGIN:
       return views::kPanelHorizMargin;
     case Metric::RELATED_BUTTON_HORIZONTAL_SPACING:
       return ChromeViewsDelegate::GetInstance()->GetDefaultDistanceMetric(
           views::DistanceMetric::RELATED_BUTTON_HORIZONTAL);
     case Metric::RELATED_CONTROL_HORIZONTAL_SPACING:
       return ChromeViewsDelegate::GetInstance()->GetDefaultDistanceMetric(
           views::DistanceMetric::RELATED_CONTROL_HORIZONTAL);
     case Metric::RELATED_CONTROL_VERTICAL_SPACING:
       return ChromeViewsDelegate::GetInstance()->GetDefaultDistanceMetric(
@@ skipping 24 matching lines @@
   return true;
 }
 
 bool LayoutDelegate::IsHarmonyMode() const {
   return false;
 }
 
 int LayoutDelegate::GetDialogPreferredWidth(DialogWidth width) const {
   return 0;
 }