1 files changed, 103 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/mochitest/FissionTestHelperParent.sys.mjs b/gfx/layers/apz/test/mochitest/FissionTestHelperParent.sys.mjs
new file mode 100644
index 0000000000..d71de3b2ad
--- /dev/null
+++ b/gfx/layers/apz/test/mochitest/FissionTestHelperParent.sys.mjs
@@ -0,0 +1,103 @@
+// This code always runs in the parent process. There is one instance of
+// this class for each "inner window" (should be one per content document,
+// including iframes/nested iframes).
+// There is a 1:1 relationship between instances of this class and
+// FissionTestHelperChild instances, and the pair are entangled such
+// that they can communicate with each other regardless of which process
+// they live in.
+
+export class FissionTestHelperParent extends JSWindowActorParent {
+  constructor() {
+    super();
+    this._testCompletePromise = new Promise(resolve => {
+      this._testCompletePromiseResolver = resolve;
+    });
+  }
+
+  embedderWindow() {
+    let embedder = this.manager.browsingContext.embedderWindowGlobal;
+    // embedder is of type WindowGlobalParent, defined in WindowGlobalActors.webidl
+    if (!embedder) {
+      dump("ERROR: no embedder found in FissionTestHelperParent\n");
+    }
+    return embedder;
+  }
+
+  docURI() {
+    return this.manager.documentURI.spec;
+  }
+
+  // Returns a promise that is resolved when this parent actor receives a
+  // "Test:Complete" message from the child.
+  getTestCompletePromise() {
+    return this._testCompletePromise;
+  }
+
+  startTest() {
+    this.sendAsyncMessage("Test:Start", {});
+  }
+
+  receiveMessage(msg) {
+    switch (msg.name) {
+      case "ok":
+        FissionTestHelperParent.SimpleTest.ok(
+          msg.data.cond,
+          this.docURI() + " | " + msg.data.msg
+        );
+        break;
+
+      case "is":
+        FissionTestHelperParent.SimpleTest.is(
+          msg.data.a,
+          msg.data.b,
+          this.docURI() + " | " + msg.data.msg
+        );
+        break;
+
+      case "Test:Complete":
+        this._testCompletePromiseResolver();
+        break;
+
+      case "EmbedderToOopif":
+        // This relays messages from the embedder to an OOP-iframe. The browsing
+        // context id in the message data identifies the OOP-iframe.
+        let oopifBrowsingContext = BrowsingContext.get(
+          msg.data.browsingContextId
+        );
+        if (oopifBrowsingContext == null) {
+          FissionTestHelperParent.SimpleTest.ok(
+            false,
+            "EmbedderToOopif couldn't find oopif"
+          );
+          break;
+        }
+        let oopifActor =
+          oopifBrowsingContext.currentWindowGlobal.getActor(
+            "FissionTestHelper"
+          );
+        if (!oopifActor) {
+          FissionTestHelperParent.SimpleTest.ok(
+            false,
+            "EmbedderToOopif couldn't find oopif actor"
+          );
+          break;
+        }
+        oopifActor.sendAsyncMessage("FromEmbedder", msg.data);
+        break;
+
+      case "OopifToEmbedder":
+        // This relays messages from the OOP-iframe to the top-level content
+        // window which is embedding it.
+        let embedderActor = this.embedderWindow().getActor("FissionTestHelper");
+        if (!embedderActor) {
+          FissionTestHelperParent.SimpleTest.ok(
+            false,
+            "OopifToEmbedder couldn't find embedder"
+          );
+          break;
+        }
+        embedderActor.sendAsyncMessage("FromOopif", msg.data);
+        break;
+    }
+  }
+}