views: implement width snapping for DialogDelegateViews

chrome/browser/ui/views/validation_message_bubble_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_VALIDATION_MESSAGE_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_VIEW_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/validation_message_bubble.h"
@@ skipping 10 matching lines @@
     : public views::BubbleDialogDelegateView,
       public ValidationMessageBubble,
       public base::SupportsWeakPtr<ValidationMessageBubbleView> {
  public:
   ValidationMessageBubbleView(content::WebContents* web_contents,
                               const gfx::Rect& anchor_in_root_view,
                               const base::string16& main_text,
                               const base::string16& sub_text);
   ~ValidationMessageBubbleView() override;
 
+  // DialogDelegateView overrides:
+  gfx::Size GetUnsnappedPreferredSize() const override;

[Peter Kasting, 2017/03/30 00:35:36]

Nit: Leave in below list

+
   // BubbleDialogDelegateView overrides:
-  gfx::Size GetPreferredSize() const override;
   int GetDialogButtons() const override;
 
   // ValidationMessageBubble overrides:
   void SetPositionRelativeToAnchor(
       content::RenderWidgetHost* widget_host,
       const gfx::Rect& anchor_in_root_view) override;
   void CloseValidationMessage() override;
 
  private:
   gfx::Rect RootViewToScreenRect(
       const gfx::Rect& rect_in_root_view,
       const content::RenderWidgetHostView* render_widget_host_view) const;
 
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(ValidationMessageBubbleView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_VIEW_H_