Attempt #1 at fixing Bug 617499 - Add an e10s test to verify behavior…

… of async messages sent by Firefox while the addon process is making a synchronous call

packages/api-utils/tests/e10s-samples/bug-617499-e10s-adapter.js

@@ -0,0 +1,17 @@
+if (this.sendMessage) {
+  // TODO: register receiver for async msg.
+  registerReceiver("asyncy", function() {
+    console.log("i am an async message from firefox");
+  });
+  exports.go = function() {
+    console.log("about to send sync message to firefox");
+    callMessage("superpower");
+    console.log("returned from sync message to firefox");
+  };
+} else {
+  exports.register = function(process) {
+    process.registerReceiver("superpower", function(name) {
+      process.sendMessage("asyncy");
+    });
+  };
+}

packages/api-utils/tests/e10s-samples/bug-617499-main.js

@@ -0,0 +1,4 @@
+exports.main = function(options, callbacks) {
+  require("e10s-samples/bug-617499").go();
+  callbacks.quit();
+}

packages/api-utils/tests/e10s-samples/bug-617499.js

@@ -0,0 +1 @@
+throw new Error("This code should never be loaded in the Firefox process!");

packages/api-utils/tests/test-e10s.js

@@ -143,6 +143,16 @@ exports.testAdapterOnlyModule = makeConsoleTest({
   ]
 });
 
+exports.testSyncCallReturnValueArrivesAfterAsyncMsgSends = makeConsoleTest({
+  main: "e10s-samples/bug-617499-main",
+  expect: [
+    ["log", "about to send sync message to firefox"],
+    ["log", "i am an async message from firefox"],
+    ["log", "returned from sync message to firefox"],
+    ["quit", "OK"]
+  ]
+});
+
 exports.testCommonJSCompliance = function(test) {
   if (xulApp.is("Firefox") &&
       xulApp.versionInRange(xulApp.version, "4.0b7", "4.0b8pre")) {