Force the video to go fullscreen when setting persistent video

content/browser/web_contents/web_contents_impl.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/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 5235 matching lines @@
     NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
   }
 }
 
 void WebContentsImpl::SetHasPersistentVideo(bool value) {
   if (has_persistent_video_ == value)
     return;
 
   has_persistent_video_ = value;
   NotifyPreferencesChanged();
+  media_web_contents_observer()->RequestPersistentVideo(value);
 }
 
 #if defined(OS_ANDROID)
 void WebContentsImpl::NotifyFindMatchRectsReply(
     int version,
     const std::vector<gfx::RectF>& rects,
     const gfx::RectF& active_rect) {
   if (delegate_)
     delegate_->FindMatchRectsReply(this, version, rects, active_rect);
 }
@@ skipping 124 matching lines @@
     RenderViewHost* render_view_host = RenderViewHost::From(render_widget_host);
     if (!render_view_host)
       continue;
     render_view_host_set.insert(render_view_host);
   }
   for (RenderViewHost* render_view_host : render_view_host_set)
     render_view_host->OnWebkitPreferencesChanged();
 }
 
 }  // namespace content