Make it possible to set the display mode from Chromium

extensions/browser/app_window/app_window.cc

 // Copyright 2014 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 "extensions/browser/app_window/app_window.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 946 matching lines @@
   }
 
   SetFullscreen(FULLSCREEN_TYPE_HTML_API, enter_fullscreen);
 }
 
 bool AppWindow::IsFullscreenForTabOrPending(const content::WebContents* source)
     const {
   return IsHtmlApiFullscreen();
 }
 
+blink::WebDisplayMode AppWindow::GetDisplayMode(
+    const content::WebContents* source) const {
+  if (IsFullscreen() && !IsHtmlApiFullscreen())
+    return blink::WebDisplayModeFullscreen;
+  return blink::WebDisplayModeStandalone;
+}
+
 void AppWindow::Observe(int type,
                         const content::NotificationSource& source,
                         const content::NotificationDetails& details) {
   switch (type) {
     case NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED: {
       const Extension* unloaded_extension =
           content::Details<UnloadedExtensionInfo>(details)->extension;
       if (extension_id_ == unloaded_extension->id())
         native_app_window_->Close();
       break;
@@ skipping 134 matching lines @@
         region.bounds.x(),
         region.bounds.y(),
         region.bounds.right(),
         region.bounds.bottom(),
         region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
   }
   return sk_region;
 }
 
 }  // namespace extensions