Block framebusts without a user gesture

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 1c0ac0a82eeb78cf7d33e84d536971e254773651..3866cc53b8531e720533726933172187f44f5e23 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -49,6 +49,12 @@ const base::Feature kFeaturePolicy{"FeaturePolicy",
 const base::Feature kFontCacheScaling{"FontCacheScaling",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables a blink::FontCache optimization that reuses a font to serve different
+// size of font.
+const base::Feature kFramebustingNeedsSameOriginOrUserGesture{
+    "FramebustingNeedsSameOriginOrUserGesture",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Can main thread be pipelined with activation. Always disabled for devices
 // with fewer than 4 cores irrespective of this flag. Can also be overridden by
 // --enable(disable)-main-frame-before-activation command line flag.