diff -r 000000000000 -r 6474c204b198 ipc/testshell/TestShellParent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/testshell/TestShellParent.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,102 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "TestShellParent.h"
+
+/* This must occur *after* TestShellParent.h to avoid typedefs conflicts. */
+#include "mozilla/ArrayUtils.h"
+
+#include "mozilla/dom/ContentParent.h"
+
+#include "nsAutoPtr.h"
+#include "nsCxPusher.h"
+
+using namespace mozilla;
+using mozilla::ipc::TestShellParent;
+using mozilla::ipc::TestShellCommandParent;
+using mozilla::ipc::PTestShellCommandParent;
+using mozilla::dom::ContentParent;
+
+PTestShellCommandParent*
+TestShellParent::AllocPTestShellCommandParent(const nsString& aCommand)
+{
+  return new TestShellCommandParent();
+}
+
+bool
+TestShellParent::DeallocPTestShellCommandParent(PTestShellCommandParent* aActor)
+{
+  delete aActor;
+  return true;
+}
+
+bool
+TestShellParent::CommandDone(TestShellCommandParent* command,
+                             const nsString& aResponse)
+{
+  // XXX what should happen if the callback fails?
+  /*bool ok = */command->RunCallback(aResponse);
+  command->ReleaseCallback();
+
+  return true;
+}
+
+bool
+TestShellCommandParent::SetCallback(JSContext* aCx,
+                                    JS::Value aCallback)
+{
+  if (!mCallback.Hold(aCx)) {
+    return false;
+  }
+
+  mCallback = aCallback;
+  mCx = aCx;
+
+  return true;
+}
+
+bool
+TestShellCommandParent::RunCallback(const nsString& aResponse)
+{
+  NS_ENSURE_TRUE(!mCallback.get().isNull() && mCx, false);
+
+  // We're pulling a cx off the heap, so make sure it's stack-top.
+  AutoCxPusher pusher(mCx);
+  NS_ENSURE_TRUE(mCallback.ToJSObject(), false);
+  JSAutoCompartment ac(mCx, mCallback.ToJSObject());
+  JS::Rooted<JSObject*> global(mCx, JS::CurrentGlobalOrNull(mCx));
+
+  JSString* str = JS_NewUCStringCopyN(mCx, aResponse.get(), aResponse.Length());
+  NS_ENSURE_TRUE(str, false);
+
+  JS::Rooted<JS::Value> strVal(mCx, JS::StringValue(str));
+
+  JS::Rooted<JS::Value> rval(mCx);
+  JS::Rooted<JS::Value> callback(mCx, mCallback);
+  bool ok = JS_CallFunctionValue(mCx, global, callback, strVal, &rval);
+  NS_ENSURE_TRUE(ok, false);
+
+  return true;
+}
+
+void
+TestShellCommandParent::ReleaseCallback()
+{
+  mCallback.Release();
+}
+
+bool
+TestShellCommandParent::ExecuteCallback(const nsString& aResponse)
+{
+  return static_cast<TestShellParent*>(Manager())->CommandDone(
+      this, aResponse);
+}
+
+void
+TestShellCommandParent::ActorDestroy(ActorDestroyReason why)
+{
+  if (why == AbnormalShutdown) {
+    ExecuteCallback(EmptyString());
+  }
+}