Provide access to the ID for the remoted Windows session in the network process

remoting/host/basic_desktop_environment.cc

Index: remoting/host/basic_desktop_environment.cc
diff --git a/remoting/host/basic_desktop_environment.cc b/remoting/host/basic_desktop_environment.cc
index b047c26804112a1de221e3b3bae8d0bb15d495f6..8d33140b97207e66afbad22f3513635f669a9c22 100644
--- a/remoting/host/basic_desktop_environment.cc
+++ b/remoting/host/basic_desktop_environment.cc
@@ -65,6 +65,10 @@ std::string BasicDesktopEnvironment::GetCapabilities() const {
 void BasicDesktopEnvironment::SetCapabilities(const std::string& capabilities) {
 }
 
+uint32_t BasicDesktopEnvironment::GetDesktopSessionId() const {
+  return UINT32_MAX;
+}
+
 std::unique_ptr<webrtc::DesktopCapturer>
 BasicDesktopEnvironment::CreateVideoCapturer() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());