[remoting android] Add native library and JNI glue for host.

remoting/host/android/jni_host.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 "remoting/host/android/jni_host.h"
+
+#include "jni/Host_jni.h"
+
+namespace remoting {
+
+JniHost::JniHost() {}
+
+JniHost::~JniHost() {}
+
+// static
+bool JniHost::RegisterJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void JniHost::Destroy(JNIEnv* env, const JavaParamRef<jobject>& caller) {
+  delete this;
+}
+
+static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& caller) {
+  return reinterpret_cast<intptr_t>(new JniHost());
+}
+
+}  // namespace remoting