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 c65b5cb297e377bd7450ebee13e60199d29eaa03..0675ad9e6595220d193c554af7b27aa6500bd6eb 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -440,7 +440,11 @@ WebPreferences RenderViewHostImpl::ComputeWebkitPrefs() {
   prefs.progress_bar_completion = GetProgressBarCompletionPolicy();
 
   prefs.use_solid_color_scrollbars = true;
-#endif
+#else  // defined(OS_ANDROID)
+  prefs.cross_origin_media_playback_requires_user_gesture =
+      base::FeatureList::GetInstance()->IsEnabled(
+          features::kCrossOriginMediaPlaybackRequiresUserGesture);
+#endif  // defined(OS_ANDROID)
 
   prefs.device_supports_touch = ui::GetTouchScreensAvailability() ==
                                 ui::TouchScreensAvailability::ENABLED;