Consolidate JNI registrations for mojo system.

mojo/android/system/mojo_jni_registrar.cc

Index: mojo/android/system/mojo_jni_registrar.cc
diff --git a/mojo/android/system/mojo_jni_registrar.cc b/mojo/android/system/mojo_jni_registrar.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2a6c34eee0e9bf286e3c8fdd9cabc141fa789317
--- /dev/null
+++ b/mojo/android/system/mojo_jni_registrar.cc
@@ -0,0 +1,26 @@
+// Copyright (c) 2017 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 "mojo/android/system/mojo_jni_registrar.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_registrar.h"
+#include "mojo/android/system/core_impl.h"
+#include "mojo/android/system/watcher_impl.h"
+
+namespace mojo {
+namespace android {
+
+static base::android::RegistrationMethod kMojoRegisteredMethods[] = {
+    {"CoreImpl", mojo::android::RegisterCoreImpl},
+    {"WatcherImpl", mojo::android::RegisterWatcherImpl},
+};
+
+bool RegisterSystemJni(JNIEnv* env) {
+  return base::android::RegisterNativeMethods(
+      env, kMojoRegisteredMethods, arraysize(kMojoRegisteredMethods));
+}
+
+}  // namespace android
+}  // namespace mojo