Force the video to go fullscreen when setting persistent video

content/browser/media/media_web_contents_observer.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 "content/browser/media/media_web_contents_observer.h"
 
 #include <memory>
 
 #include "build/build_config.h"
 #include "content/browser/media/audible_metrics.h"
@@ skipping 91 matching lines @@
     CreateVideoPowerSaveBlocker();
 }
 
 void MediaWebContentsObserver::WasHidden() {
   // If there are entities capturing screenshots or video (e.g., mirroring),
   // don't release the power save blocker.
   if (!web_contents()->GetCapturerCount())
     video_power_save_blocker_.reset();
 }
 
+void MediaWebContentsObserver::RequestPersistentVideo(bool value) {
+  if (!fullscreen_player_)
+    return;
+
+  // The message is sent to the renderer even though the video is already the
+  // fullscreen element itself. It will eventually be handled by Blink.
+  Send(new MediaPlayerDelegateMsg_BecamePersistentVideo(
+      fullscreen_player_->first->GetRoutingID(), fullscreen_player_->second,
+      value));
+}
+
 void MediaWebContentsObserver::OnMediaDestroyed(
     RenderFrameHost* render_frame_host,
     int delegate_id) {
   OnMediaPaused(render_frame_host, delegate_id, true);
 }
 
 void MediaWebContentsObserver::OnMediaPaused(RenderFrameHost* render_frame_host,
                                              int delegate_id,
                                              bool reached_end_of_stream) {
   const MediaPlayerId player_id(render_frame_host, delegate_id);
@@ skipping 154 matching lines @@
   if (it == player_map->end())
     return;
 
   for (int delegate_id : it->second)
     removed_players->insert(MediaPlayerId(render_frame_host, delegate_id));
 
   player_map->erase(it);
 }
 
 }  // namespace content