views: implement width snapping for DialogDelegateViews

ui/views/window/dialog_delegate_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 <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/hit_test.h"
 #include "ui/events/event_processor.h"
@@ skipping 49 matching lines @@
   bool Accept() override {
     accepted_ = true;
     return closeable_;
   }
   bool Close() override {
     closed_ = true;
     return closeable_;
   }
 
   // DialogDelegateView overrides:
-  gfx::Size GetPreferredSize() const override { return gfx::Size(200, 200); }
+  gfx::Size GetUnsnappedPreferredSize() const override {
+    return gfx::Size(200, 200);
+  }
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override {
     return should_handle_escape_;
   }
   base::string16 GetWindowTitle() const override { return title_; }
   View* GetInitiallyFocusedView() override { return input_; }
   bool ShouldUseCustomFrame() const override { return true; }
 
   void CheckAndResetStates(bool canceled,
                            bool accepted,
                            bool closed) {
@@ skipping 262 matching lines @@
   // On showing the dialog, the initially focused View will be the OK button.
   // Since it is no longer focusable, focus should advance to the next focusable
   // View, which is |textfield|.
   dialog_widget->Show();
   EXPECT_TRUE(textfield->HasFocus());
   EXPECT_EQ(textfield, dialog->GetFocusManager()->GetFocusedView());
   dialog_widget->CloseNow();
 }
 
 }  // namespace views