Connect to DesktopEnvironment's stubs only when audio/video schedulers are about to be created.

remoting/host/client_session.cc

Index: remoting/host/client_session.cc
diff --git a/remoting/host/client_session.cc b/remoting/host/client_session.cc
index f1722595d447a0523dd812829ad83c2668e1a8b3..58320c9f4101ff7a628d0235730d2cd4d2cf619e 100644
--- a/remoting/host/client_session.cc
+++ b/remoting/host/client_session.cc
@@ -41,13 +41,10 @@ ClientSession::ClientSession(
       connection_factory_(connection_.get()),
       desktop_environment_(desktop_environment_factory->Create()),
       client_jid_(connection_->session()->jid()),
-      host_clipboard_stub_(desktop_environment_->event_executor()),
-      host_input_stub_(desktop_environment_->event_executor()),
-      input_tracker_(host_input_stub_),
+      input_tracker_(&host_input_filter_),
       remote_input_filter_(&input_tracker_),
-      mouse_clamping_filter_(desktop_environment_->video_capturer(),
-                             &remote_input_filter_),
-      disable_input_filter_(&mouse_clamping_filter_),
+      mouse_clamping_filter_(&remote_input_filter_, connection_->video_stub()),
+      disable_input_filter_(mouse_clamping_filter_.input_filter()),
       disable_clipboard_filter_(clipboard_echo_filter_.host_filter()),
       auth_input_filter_(&disable_input_filter_),
       auth_clipboard_filter_(&disable_clipboard_filter_),
@@ -66,7 +63,6 @@ ClientSession::ClientSession(
   connection_->set_clipboard_stub(&auth_clipboard_filter_);
   connection_->set_host_stub(this);
   connection_->set_input_stub(&auth_input_filter_);
-  clipboard_echo_filter_.set_host_stub(host_clipboard_stub_);
 
   // |auth_*_filter_|'s states reflect whether the session is authenticated.
   auth_input_filter_.set_enabled(false);
@@ -127,6 +123,11 @@ void ClientSession::OnConnectionChannelsConnected(
     protocol::ConnectionToClient* connection) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
+
+  // Connect the host clipboard and input stubs.
+  host_input_filter_.set_input_stub(desktop_environment_->event_executor());
+  clipboard_echo_filter_.set_host_stub(desktop_environment_->event_executor());
+
   SetDisableInputs(false);
 
   // Let the desktop environment notify us of local clipboard changes.
@@ -148,7 +149,7 @@ void ClientSession::OnConnectionChannelsConnected(
       desktop_environment_->video_capturer(),
       video_encoder.Pass(),
       connection_->client_stub(),
-      connection_->video_stub());
+      &mouse_clamping_filter_);
   ++active_recorders_;
 
   // Create an AudioScheduler if audio is enabled, to pump audio samples.