Handle Security Key requests from outside the remoted session correctly

remoting/host/security_key/security_key_ipc_client.h

Index: remoting/host/security_key/security_key_ipc_client.h
diff --git a/remoting/host/security_key/security_key_ipc_client.h b/remoting/host/security_key/security_key_ipc_client.h
index cfdbec54d7bc4d87a4d28cc439528138b0800454..c51b059e990e5861ac47c7471e14f4bdfec0187e 100644
--- a/remoting/host/security_key/security_key_ipc_client.h
+++ b/remoting/host/security_key/security_key_ipc_client.h
@@ -34,18 +34,21 @@ class SecurityKeyIpcClient : public IPC::Listener {
   typedef base::Callback<void(const std::string& response_data)>
       ResponseCallback;
 
+  // Used to indicate whether the channel can be used for request forwarding.
+  typedef base::Callback<void(bool connection_usable)> ConnectedCallback;
+
   // Returns true if there is an active remoting session which supports
   // security key request forwarding.
   virtual bool CheckForSecurityKeyIpcServerChannel();
 
   // Begins the process of connecting to the IPC channel which will be used for
   // exchanging security key messages.
-  // |connection_ready_callback| is called when a channel has been established
-  // and security key requests can be sent.
+  // |connected_callback| is called when a channel has been established and
+  // indicates whether security key requests can be sent using it.
   // |connection_error_callback| is stored and will be called back for any
   // unexpected errors that occur while establishing, or during, the session.
   virtual void EstablishIpcConnection(
-      const base::Closure& connection_ready_callback,
+      const ConnectedCallback& connected_callback,
       const base::Closure& connection_error_callback);
 
   // Sends a security key request message to the network process to be forwarded
@@ -70,8 +73,11 @@ class SecurityKeyIpcClient : public IPC::Listener {
   void OnChannelConnected(int32_t peer_pid) override;
   void OnChannelError() override;
 
-  // Handles the ConnectionDetails IPC message.
-  void OnConnectionDetails(const std::string& request_data);
+  // Handles the ConnectionReady IPC message.
+  void OnConnectionReady();
+
+  // Handles the InvalidSession IPC message.
+  void OnInvalidSession();
 
   // Handles security key response IPC messages.
   void OnSecurityKeyResponse(const std::string& request_data);
@@ -83,7 +89,6 @@ class SecurityKeyIpcClient : public IPC::Listener {
   // '0' (default) corresponds to the session the network process runs in.
   uint32_t expected_ipc_server_session_id_ = 0;
 
-
   // Name of the initial IPC channel used to retrieve connection info.
   mojo::edk::NamedPlatformHandle named_channel_handle_;
 
@@ -91,7 +96,7 @@ class SecurityKeyIpcClient : public IPC::Listener {
   mojo::edk::ScopedPlatformHandle channel_handle_;
 
   // Signaled when the IPC connection is ready for security key requests.
-  base::Closure connection_ready_callback_;
+  ConnectedCallback connected_callback_;
 
   // Signaled when an error occurs in either the IPC channel or communication.
   base::Closure connection_error_callback_;