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 50fded8612ae5dbaaef01cd6bc0df976b3dc0eb2..e49a1c7df4aa150e1d030158457db570ffdce9d6 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -258,6 +258,14 @@ 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.