Host extensions

remoting/host/client_session.h

Index: remoting/host/client_session.h
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index f8923297df77816725a250ab44a445eb4edae483..a86839ec5875e133f5a6f87a987829cd112aeb40 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/threading/non_thread_safe.h"
@@ -15,6 +16,8 @@
 #include "base/timer/timer.h"
 #include "remoting/host/client_session_control.h"
 #include "remoting/host/gnubby_auth_handler.h"
+#include "remoting/host/host_extension.h"
+#include "remoting/host/host_extension_session.h"
 #include "remoting/host/mouse_clamping_filter.h"
 #include "remoting/host/remote_input_filter.h"
 #include "remoting/protocol/clipboard_echo_filter.h"
@@ -64,6 +67,9 @@ class ClientSession
     // Called after we've finished connecting all channels.
     virtual void OnSessionChannelsConnected(ClientSession* client) = 0;
 
+    // Called after client has reported capabilities.
+    virtual void OnSessionClientCapabilities(ClientSession* client) = 0;
+
     // Called after authentication has failed. Must not tear down this
     // object. OnSessionClosed() is notified after this handler
     // returns.
@@ -103,6 +109,13 @@ class ClientSession
       scoped_refptr<protocol::PairingRegistry> pairing_registry);
   virtual ~ClientSession();
 
+  // Adds an extension to client to handle extension messages.
+  void AddExtensionSession(scoped_ptr<HostExtensionSession> extension_session);
+
+  // Adds extended capabilities to advertise to the client, e.g. those
+  // implemented by |DesktopEnvironment| or |HostExtension|s.
+  void AddHostCapabilities(const std::string& capability);
+
   // protocol::HostStub interface.
   virtual void NotifyClientResolution(
       const protocol::ClientResolution& resolution) OVERRIDE;
@@ -148,7 +161,13 @@ class ClientSession
 
   bool is_authenticated() { return auth_input_filter_.enabled();  }
 
+  const std::string* client_capabilities() const {
+    return client_capabilities_.get();
+  }
+
  private:
+  typedef ScopedVector<HostExtensionSession> HostExtensionSessionList;
+
   // Creates a proxy for sending clipboard events to the client.
   scoped_ptr<protocol::ClipboardStub> CreateClipboardProxy();
 
@@ -244,6 +263,9 @@ class ClientSession
   // Used to proxy gnubby auth traffic.
   scoped_ptr<GnubbyAuthHandler> gnubby_auth_handler_;
 
+  // Host extension sessions, used to handle extension messages.
+  HostExtensionSessionList extension_sessions_;
+
   DISALLOW_COPY_AND_ASSIGN(ClientSession);
 };