Add support for calling the java Callback from native.

base/android/callback_android.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/android/callback_android.h"
+
+#include "jni/Callback_jni.h"
+
+namespace base {
+namespace android {
+
+void RunCallbackAndroid(const JavaRef<jobject>& callback,
+                        const JavaRef<jobject>& arg) {
+  Java_Callback_onResultFromNativeV_JLO(base::android::AttachCurrentThread(),
+                                        callback.obj(),
+                                        arg.obj());
+}
+
+void RunCallbackAndroid(const JavaRef<jobject>& callback, bool arg) {
+  Java_Callback_onResultFromNativeV_Z(base::android::AttachCurrentThread(),
+                                      callback.obj(),
+                                      static_cast<jboolean>(arg));
+}
+
+bool RegisterCallbackAndroid(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace android
+}  // namespace base