Add a way for JNI registrars to specify methods to be registered for tests.

content/app/android/content_jni_registrar.cc

 // Copyright (c) 2012 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 "content/app/android/content_jni_registrar.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "content/app/android/content_main.h"
 #include "content/app/android/sandboxed_process_service.h"
@@ skipping 26 matching lines @@
   { "TouchPoint", content::RegisterTouchPoint },
   { "TraceEvent", RegisterTraceEvent },
   { "UserAgent", content::RegisterUserAgent },
 };
 
 bool RegisterJni(JNIEnv* env) {
   return RegisterNativeMethods(env, kContentRegisteredMethods,
                                arraysize(kContentRegisteredMethods));
 }
 
+// Add the methods to be registered for APK unit tests.
+ADD_JNI_REGISTRATION_METHODS_FOR_TESTS(kContentRegisteredMethods)
+
 }  // namespace android
 }  // namespace content