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

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index bd45f5364edae9520ea4c36f17e3ba2b3a973b86..8f3246921be83e71022b6b9b90f59ed6e3a6df08 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1153,10 +1153,18 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
       base::android::BuildInfo::GetInstance()->sdk_int() <=
           base::android::SDK_VERSION_JELLY_BEAN_MR2 ||
       base::SysInfo::IsLowEndDevice();
-  settings->setForcePreloadNoneForMediaElements(is_low_end_device);
   WebRuntimeFeatures::enableAutoplayMutedVideos(
       prefs.autoplay_muted_videos_enabled && !is_low_end_device);
+  settings->setForcePreloadNoneForMediaElements(is_low_end_device);
   settings->setSpellCheckEnabledByDefault(prefs.spellcheck_enabled_by_default);
+#else
+  WebRuntimeFeatures::enableAutoplayMutedVideos(
+      prefs.autoplay_muted_videos_enabled);
+#endif
+
+#if !defined(OS_ANDROID)
+  settings->setMediaPlaybackInCrossOriginIframesRequiresUserGesture(
+      prefs.user_gesture_required_for_media_playback_in_cross_origin_iframes);
 #endif
 
   settings->setAutoplayExperimentMode(