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

content/public/common/web_preferences.h

Index: content/public/common/web_preferences.h
diff --git a/content/public/common/web_preferences.h b/content/public/common/web_preferences.h
index e6ad3dcf1859674a1af9781a0b654de9286d5596..1b5944a512fcd03a3d314b6a38f36f3699ec70bf 100644
--- a/content/public/common/web_preferences.h
+++ b/content/public/common/web_preferences.h
@@ -249,7 +249,9 @@ struct CONTENT_EXPORT WebPreferences {
   bool spellcheck_enabled_by_default;
   // If enabled, when a video goes fullscreen, the orientation should be locked.
   bool video_fullscreen_orientation_lock_enabled;
-#endif
+#else  // defined(OS_ANDROID)
+  bool cross_origin_media_playback_requires_user_gesture;
+#endif  // defined(OS_ANDROID)
 
   // Default (used if the page or UA doesn't override these) values for page
   // scale limits. These are set directly on the WebView so there's no analogue