Cross-process frames should be notified of device scale factor changes.

content/browser/web_contents/web_contents_view_mac.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ skipping 57 matching lines @@
   // our lifetime. This doesn't need to be the case, but is this way currently
   // because that's what was easiest when they were split.
   WebContentsViewMac(WebContentsImpl* web_contents,
                      WebContentsViewDelegate* delegate);
   ~WebContentsViewMac() override;
 
   // WebContentsView implementation --------------------------------------------
   gfx::NativeView GetNativeView() const override;
   gfx::NativeView GetContentNativeView() const override;
   gfx::NativeWindow GetTopLevelNativeWindow() const override;
+  void GetScreenInfo(blink::WebScreenInfo* web_screen_info) const override;
   void GetContainerBounds(gfx::Rect* out) const override;
   void SizeContents(const gfx::Size& size) override;
   void Focus() override;
   void SetInitialFocus() override;
   void StoreFocus() override;
   void RestoreFocus() override;
   DropData* GetDropData() const override;
   gfx::Rect GetViewBounds() const override;
   void SetAllowOtherViews(bool allow) override;
   bool GetAllowOtherViews() const override;
@@ skipping 62 matching lines @@
   bool allow_other_views_;
 
   std::unique_ptr<PopupMenuHelper> popup_menu_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_