diff -r 000000000000 -r 6474c204b198 widget/android/AndroidJNIWrapper.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/android/AndroidJNIWrapper.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,124 @@
+/* -*- Mode: c++; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * 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 <android/log.h>
+#include <dlfcn.h>
+#include <prthread.h>
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Assertions.h"
+#include "nsThreadUtils.h"
+#include "AndroidBridge.h"
+
+extern "C" {
+  jclass __jsjni_GetGlobalClassRef(const char *className);
+}
+
+class GetGlobalClassRefRunnable : public nsRunnable {
+  public:
+    GetGlobalClassRefRunnable(const char *className, jclass *foundClass) :
+        mClassName(className), mResult(foundClass) {}
+    NS_IMETHOD Run() {
+        *mResult = __jsjni_GetGlobalClassRef(mClassName);
+        return NS_OK;
+    }
+  private:
+    const char *mClassName;
+    jclass *mResult;
+};
+
+extern "C" {
+  __attribute__ ((visibility("default")))
+  jclass
+  jsjni_FindClass(const char *className) {
+    // FindClass outside the main thread will run into problems due
+    // to missing the classpath
+    MOZ_ASSERT(NS_IsMainThread());
+    JNIEnv *env = mozilla::AndroidBridge::GetJNIEnv();
+    return env->FindClass(className);
+  }
+
+  jclass
+  __jsjni_GetGlobalClassRef(const char *className) {
+    // root class globally
+    JNIEnv *env = mozilla::AndroidBridge::GetJNIEnv();
+    jclass globalRef = static_cast<jclass>(env->NewGlobalRef(env->FindClass(className)));
+    if (!globalRef)
+      return nullptr;
+
+    // return the newly create global reference
+    return globalRef;
+  }
+
+  __attribute__ ((visibility("default")))
+  jclass
+  jsjni_GetGlobalClassRef(const char *className) {
+    nsCOMPtr<nsIThread> mainThread;
+    mozilla::DebugOnly<nsresult> rv = NS_GetMainThread(getter_AddRefs(mainThread));
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+    jclass foundClass;
+    nsRefPtr<nsIRunnable> runnable_ref(new GetGlobalClassRefRunnable(className,
+                                                                     &foundClass));
+    mainThread->Dispatch(runnable_ref, NS_DISPATCH_SYNC);
+    if (!foundClass)
+      return nullptr;
+
+    return foundClass;
+  }
+
+  __attribute__ ((visibility("default")))
+  jmethodID
+  jsjni_GetStaticMethodID(jclass methodClass,
+                          const char *methodName,
+                          const char *signature) {
+    JNIEnv *env = mozilla::AndroidBridge::GetJNIEnv();
+    return env->GetStaticMethodID(methodClass, methodName, signature);
+  }
+
+  __attribute__ ((visibility("default")))
+  bool
+  jsjni_ExceptionCheck() {
+    JNIEnv *env = mozilla::AndroidBridge::GetJNIEnv();
+    return env->ExceptionCheck();
+  }
+
+  __attribute__ ((visibility("default")))
+  void
+  jsjni_CallStaticVoidMethodA(jclass cls,
+                              jmethodID method,
+                              jvalue *values) {
+    JNIEnv *env = mozilla::AndroidBridge::GetJNIEnv();
+
+    mozilla::AutoLocalJNIFrame jniFrame(env);
+    env->CallStaticVoidMethodA(cls, method, values);
+  }
+
+  __attribute__ ((visibility("default")))
+  int
+  jsjni_CallStaticIntMethodA(jclass cls,
+                             jmethodID method,
+                             jvalue *values) {
+    JNIEnv *env = mozilla::AndroidBridge::GetJNIEnv();
+
+    mozilla::AutoLocalJNIFrame jniFrame(env);
+    return env->CallStaticIntMethodA(cls, method, values);
+  }
+
+  __attribute__ ((visibility("default")))
+  jobject jsjni_GetGlobalContextRef() {
+    return mozilla::AndroidBridge::Bridge()->GetGlobalContextRef();
+  }
+
+  __attribute__ ((visibility("default")))
+  JavaVM* jsjni_GetVM() {
+    return mozilla::AndroidBridge::GetVM();
+  }
+
+  __attribute__ ((visibility("default")))
+  JNIEnv* jsjni_GetJNIForThread() {
+    return GetJNIForThread();
+  }
+}