Don't show media controls when there is a persistent video.

content/browser/renderer_host/render_view_host_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/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 514 matching lines @@
       plugin_mixed_content_status == "BlockableMixedContent";
 
   prefs.v8_cache_options = GetV8CacheOptions();
 
   prefs.user_gesture_required_for_presentation = !command_line.HasSwitch(
       switches::kDisableGestureRequirementForPresentation);
 
   if (delegate_ && delegate_->HideDownloadUI())
     prefs.hide_download_ui = true;
 
+  // `media_controls_enabled` is `true` by default.
+  if (delegate_ && delegate_->HasPersistentVideo())
+    prefs.media_controls_enabled = false;
+
   prefs.background_video_track_optimization_enabled =
       base::FeatureList::IsEnabled(media::kBackgroundVideoTrackOptimization);
 
   // TODO(avayvod, asvitkine): Query the value directly when it is available in
   // the renderer process. See https://crbug.com/681160.
   prefs.max_keyframe_distance_to_disable_background_video =
       base::TimeDelta::FromMilliseconds(
           variations::GetVariationParamByFeatureAsInt(
               media::kBackgroundVideoTrackOptimization,
               "max_keyframe_distance_ms",
@@ skipping 404 matching lines @@
   } else {
     render_view_ready_on_process_launch_ = true;
   }
 }
 
 void RenderViewHostImpl::RenderViewReady() {
   delegate_->RenderViewReady(this);
 }
 
 }  // namespace content