views: implement width snapping for DialogDelegateViews

chrome/browser/ui/views/payments/payment_request_dialog_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 68 matching lines @@
   void ShowShippingOptionSheet();
   void ShowCreditCardEditor();
   void ShowShippingAddressEditor();
   void EditorViewUpdated();
 
   ViewStack* view_stack_for_testing() { return &view_stack_; }
 
  private:
   void ShowInitialPaymentSheet();
 
+  // views::DialogDelegateView

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

Nit: Combine with section below

+  gfx::Size GetUnsnappedPreferredSize() const override;
+
   // views::View
-  gfx::Size GetPreferredSize() const override;
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
   // Non-owned reference to the PaymentRequest that initiated this dialog. Since
   // the PaymentRequest object always outlives this one, the pointer should
   // always be valid even though there is no direct ownership relationship
   // between the two.
   PaymentRequest* request_;
   ControllerMap controller_map_;
   ViewStack view_stack_;
 
   // May be null.
   ObserverForTest* observer_for_testing_;
 
   // Used when the dialog is being closed to avoid re-entrancy into the
   // controller_map_.
   bool being_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestDialogView);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_