Frame ancestry handler refactor (#1352)

* Validate source window before handling messages

* Add unregisterHandler to CrossFrameAPI

* Refactor the process FrameAncestryHandler uses to get ancestor frame IDs

* Store a mapping of child frame information

* Update getFrameAncestryInfo to only run once

1 files changed, 6 insertions, 0 deletions

diff --git a/ext/mixed/js/comm.js b/ext/mixed/js/comm.js
index ea450da6..997249c8 100644
--- a/ext/mixed/js/comm.js
+++ b/ext/mixed/js/comm.js
@@ -248,6 +248,12 @@ class CrossFrameAPI {
         }
     }
 
+    unregisterHandler(key) {
+        return this._messageHandlers.delete(key);
+    }
+
+    // Private
+
     _onConnect(port) {
         try {
             let details;