diff -r 000000000000 -r 6474c204b198 mobile/android/base/util/GeckoBackgroundThread.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/util/GeckoBackgroundThread.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* 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/. */
+
+package org.mozilla.gecko.util;
+
+import android.os.Handler;
+import android.os.Looper;
+
+import java.util.concurrent.SynchronousQueue;
+
+final class GeckoBackgroundThread extends Thread {
+    private static final String LOOPER_NAME = "GeckoBackgroundThread";
+
+    // Guarded by 'this'.
+    private static Handler sHandler = null;
+    private SynchronousQueue<Handler> mHandlerQueue = new SynchronousQueue<Handler>();
+
+    // Singleton, so private constructor.
+    private GeckoBackgroundThread() {
+        super();
+    }
+
+    @Override
+    public void run() {
+        setName(LOOPER_NAME);
+        Looper.prepare();
+        try {
+            mHandlerQueue.put(new Handler());
+        } catch (InterruptedException ie) {}
+
+        Looper.loop();
+    }
+
+    // Get a Handler for a looper thread, or create one if it doesn't yet exist.
+    /*package*/ static synchronized Handler getHandler() {
+        if (sHandler == null) {
+            GeckoBackgroundThread lt = new GeckoBackgroundThread();
+            ThreadUtils.setBackgroundThread(lt);
+            lt.start();
+            try {
+                sHandler = lt.mHandlerQueue.take();
+            } catch (InterruptedException ie) {}
+        }
+        return sHandler;
+    }
+
+    /*package*/ static void post(Runnable runnable) {
+        Handler handler = getHandler();
+        if (handler == null) {
+            throw new IllegalStateException("No handler! Must have been interrupted. Not posting.");
+        }
+        handler.post(runnable);
+    }
+}