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

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index ff879647c77ed45de491a7d72d64f44e12ffcdeb..57f1ba6bab59e94fb6803fc4eecf3e7526abd1ed 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -254,6 +254,14 @@ const base::Feature kWebPayments{"WebPayments",
 
 #endif
 
+#if !defined(OS_ANDROID)
+// Controls whether media playback in cross-origin iframes is enabled. The
+// feature overrides |kDisableGestureRequirementForMediaPlayback|.
+const base::Feature kCrossOriginMediaPlaybackRequiresUserGesture{
+    "CrossOriginMediaPlaybackRequiresUserGesture",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+#endif  // !defined(OS_ANDROID)
+
 #if defined(OS_WIN)
 // Emergency "off switch" for new Windows sandbox security mitigation,
 // sandbox::MITIGATION_EXTENSION_POINT_DISABLE.