Add fake for InstanceIDWithSubtype.java, in order to re-use unit test

components/gcm_driver/instance_id/instance_id_android.cc

 // Copyright 2015 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 "components/gcm_driver/instance_id/instance_id_android.h"
 
 #include <stdint.h>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "jni/InstanceIDBridge_jni.h"
 
 using base::android::AttachCurrentThread;
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
 
 namespace instance_id {
 
+InstanceIDAndroid::ScopedBlockOnAsyncTasksForTesting::
+    ScopedBlockOnAsyncTasksForTesting() {
+  JNIEnv* env = AttachCurrentThread();
+  previous_value_ =
+      Java_InstanceIDBridge_setBlockOnAsyncTasksForTesting(env, true);
+}
+
+InstanceIDAndroid::ScopedBlockOnAsyncTasksForTesting::
+    ~ScopedBlockOnAsyncTasksForTesting() {
+  JNIEnv* env = AttachCurrentThread();
+  Java_InstanceIDBridge_setBlockOnAsyncTasksForTesting(env, previous_value_);
+}
+
 // static
 bool InstanceIDAndroid::RegisterJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 // static
 scoped_ptr<InstanceID> InstanceID::Create(const std::string& app_id,
                                           gcm::InstanceIDHandler* unused) {
   return make_scoped_ptr(new InstanceIDAndroid(app_id));
 }
@@ skipping 132 matching lines @@
     jboolean success) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   DeleteIDCallback* callback = delete_id_callbacks_.Lookup(request_id);
   DCHECK(callback);
   callback->Run(success ? InstanceID::SUCCESS : InstanceID::UNKNOWN_ERROR);
   delete_id_callbacks_.Remove(request_id);
 }
 
 }  // namespace instance_id