Adding an experimental flag to block autoplay with sound in cross-origin iframes

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index a0f34b66f7d98c3db9ead41896275692cb19d157..59118de3f06eb80c133318c413bf8a68a450f144 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -494,14 +494,19 @@ WebPreferences RenderViewHostImpl::ComputeWebkitPrefs() {
   prefs.user_gesture_required_for_media_playback = !command_line.HasSwitch(
       switches::kDisableGestureRequirementForMediaPlayback) &&
           (autoplay_group_name.empty() || autoplay_group_name != "Enabled");
-  prefs.autoplay_muted_videos_enabled =
-      base::FeatureList::IsEnabled(features::kAutoplayMutedVideos);
-
   prefs.progress_bar_completion = GetProgressBarCompletionPolicy();
 
   prefs.use_solid_color_scrollbars = true;
 #endif
 
+  prefs.autoplay_muted_videos_enabled =
+      base::FeatureList::IsEnabled(features::kAutoplayMutedVideos);
+#if !defined(OS_ANDROID)
+  prefs.user_gesture_required_for_media_playback_in_cross_origin_iframes =
+      base::FeatureList::IsEnabled(
+          features::kUserGestureRequiredForMediaPlaybackInCrossOriginIframes);
+#endif
+
   // Handle autoplay gesture override experiment.
   // Note that anything but a well-formed string turns the experiment off.
   prefs.autoplay_experiment_mode = base::FieldTrialList::FindFullName(