views: implement width snapping for DialogDelegateViews

ui/views/widget/root_view_unittest.cc

 // Copyright 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/widget/root_view.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "ui/events/event_utils.h"
 #include "ui/views/context_menu_controller.h"
@@ skipping 531 matching lines @@
 }
 
 namespace {
 class RootViewTestDialogDelegate : public DialogDelegateView {
  public:
   RootViewTestDialogDelegate() {}
 
   int layout_count() const { return layout_count_; }
 
   // DialogDelegateView:
-  gfx::Size GetPreferredSize() const override { return preferred_size_; }
+  gfx::Size GetUnsnappedPreferredSize() const override {
+    return preferred_size_;
+  }
   void Layout() override {
     EXPECT_EQ(size(), preferred_size_);
     ++layout_count_;
   }
   int GetDialogButtons() const override {
     return ui::DIALOG_BUTTON_NONE;  // Ensure buttons do not influence size.
   }
 
  private:
   const gfx::Size preferred_size_ = gfx::Size(111, 111);
@@ skipping 16 matching lines @@
   // Also test Aura desktop Widget codepaths.
   views_delegate()->set_use_desktop_native_widgets(true);
   delegate = new RootViewTestDialogDelegate();
   widget = DialogDelegate::CreateDialogWidget(delegate, GetContext(), nullptr);
   EXPECT_EQ(1, delegate->layout_count());
   widget->CloseNow();
 }
 
 }  // namespace test
 }  // namespace views