views: implement width snapping for DialogDelegateViews

chrome/browser/ui/views/passwords/account_chooser_dialog_view.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PASSWORDS_ACCOUNT_CHOOSER_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PASSWORDS_ACCOUNT_CHOOSER_DIALOG_VIEW_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/passwords/password_dialog_prompts.h"
 #include "ui/views/controls/button/button.h"
@@ skipping 26 matching lines @@
   bool ShouldShowWindowTitle() const override;
   bool ShouldShowCloseButton() const override;
   void WindowClosing() override;
 
   // DialogDelegate:
   bool Accept() override;
   int GetDialogButtons() const override;
   bool ShouldDefaultButtonBeBlue() const override;
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
 
-  // views::View
-  gfx::Size GetPreferredSize() const override;
+  // DialogDelegateView

[Peter Kasting, 2017/03/30 00:35:35]

Nit: Combine this group with the two above (class does not subclass
WidgetDelegate or DialogDelegate directly)

+  gfx::Size GetUnsnappedPreferredSize() const override;
 
   // StyledLabelListener:
   void StyledLabelLinkClicked(views::StyledLabel* label,
                               const gfx::Range& range,
                               int event_flags) override;
 
   // ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // Sets up the child views.
   void InitWindow();
 
   // A weak pointer to the controller.
   PasswordDialogController* controller_;
   content::WebContents* web_contents_;
   // The "Sign in" button is shown for one credential only. The variable is
   // cached because the framework can call GetDialogButtons() after the
   // controller is gone.
   bool show_signin_button_;
 
   DISALLOW_COPY_AND_ASSIGN(AccountChooserDialogView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PASSWORDS_ACCOUNT_CHOOSER_DIALOG_VIEW_H_