[remoting android] Plumb It2Me events from C++ to Java

remoting/host/android/jni_host.h

 // 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.
 
 #ifndef REMOTING_HOST_ANDROID_JNI_HOST_H_
 #define REMOTING_HOST_ANDROID_JNI_HOST_H_
 
 #include <jni.h>
 
 #include <memory>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "remoting/host/it2me/it2me_host.h"
 
 namespace remoting {
 
 class ChromotingHostContext;
 class It2MeHostFactory;
 
 class JniHost : public It2MeHost::Observer {
  public:
-  JniHost();
+  JniHost(JNIEnv* env, jobject java_host);
   virtual ~JniHost();
 
   // Register C++ methods exposed to Java using JNI.
   static bool RegisterJni(JNIEnv* env);
 
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& caller);
 
   void Connect(JNIEnv* env,
                const base::android::JavaParamRef<jobject>& caller,
                const base::android::JavaParamRef<jstring>& user_name,
                const base::android::JavaParamRef<jstring>& auth_token);
 
   void Disconnect(JNIEnv* env,
                   const base::android::JavaParamRef<jobject>& caller);
 
   // It2MeHost::Observer implementation.
   void OnClientAuthenticated(const std::string& client_username) override;
   void OnStoreAccessCode(const std::string& access_code,
                          base::TimeDelta access_code_lifetime) override;
   void OnNatPolicyChanged(bool nat_traversal_enabled) override;
   void OnStateChanged(It2MeHostState state,
                       const std::string& error_message) override;
 
  private:
+  base::android::ScopedJavaGlobalRef<jobject> java_host_;
+
   std::unique_ptr<base::MessageLoopForUI> ui_loop_;
   std::unique_ptr<ChromotingHostContext> host_context_;
   std::unique_ptr<It2MeHostFactory> factory_;
   scoped_refptr<It2MeHost> it2me_host_;
 
   // IT2Me Talk server configuration used by |it2me_host_| to connect.
   XmppSignalStrategy::XmppServerConfig xmpp_server_config_;
 
   base::WeakPtr<JniHost> weak_ptr_;
   base::WeakPtrFactory<JniHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JniHost);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_ANDROID_JNI_HOST_H_