views: implement width snapping for DialogDelegateViews

ui/views/window/dialog_client_view_unittest.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 "ui/views/window/dialog_client_view.h"
 
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "ui/base/test/material_design_controller_test_api.h"
@@ skipping 26 matching lines @@
     widget_->Init(params);
     EXPECT_EQ(this, GetContentsView());
   }
 
   void TearDown() override {
     widget_->CloseNow();
     WidgetTest::TearDown();
   }
 
   // DialogDelegateView:
-  gfx::Size GetPreferredSize() const override { return preferred_size_; }
+  gfx::Size GetUnsnappedPreferredSize() const override {
+    return preferred_size_;
+  }
   gfx::Size GetMinimumSize() const override { return min_size_; }
   gfx::Size GetMaximumSize() const override { return max_size_; }
   ClientView* CreateClientView(Widget* widget) override {
     client_view_ = new DialogClientView(widget, this);
     return client_view_;
   }
 
   bool ShouldUseCustomFrame() const override { return false; }
 
   void DeleteDelegate() override {
@@ skipping 341 matching lines @@
   delete extra_button;
 
   // Non-buttons should always be sized to their preferred size.
   View* boring_view = new StaticSizedView(gfx::Size(20, 20));
   SetExtraView(boring_view);
   CheckContentsIsSetToPreferredSize();
   EXPECT_EQ(20, boring_view->width());
 }
 
 }  // namespace views