Make it possible to set the display mode from Chromium

content/public/browser/web_contents_delegate.cc

 // 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.
 
 #include "content/public/browser/web_contents_delegate.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 133 matching lines @@
 
 bool WebContentsDelegate::EmbedsFullscreenWidget() const {
   return false;
 }
 
 bool WebContentsDelegate::IsFullscreenForTabOrPending(
     const WebContents* web_contents) const {
   return false;
 }
 
+blink::WebDisplayMode WebContentsDelegate::GetDisplayMode(
+    const WebContents* web_contents) const {
+  return blink::WebDisplayModeBrowser;
+}
+
 content::ColorChooser* WebContentsDelegate::OpenColorChooser(
     WebContents* web_contents,
     SkColor color,
     const std::vector<ColorSuggestion>& suggestions) {
   return nullptr;
 }
 
 void WebContentsDelegate::RequestMediaAccessPermission(
     WebContents* web_contents,
     const MediaStreamRequest& request,
@@ skipping 47 matching lines @@
 
 bool WebContentsDelegate::IsNeverVisible(WebContents* web_contents) {
   return false;
 }
 
 bool WebContentsDelegate::SaveFrame(const GURL& url, const Referrer& referrer) {
   return false;
 }
 
 }  // namespace content