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

remoting/host/fake_desktop_environment.cc

Index: remoting/host/fake_desktop_environment.cc
diff --git a/remoting/host/fake_desktop_environment.cc b/remoting/host/fake_desktop_environment.cc
index 0c3528cc1f6b9f85b1f944de9a64279a8a71ee5a..d2faf911e6602f6cff1bc8d1134e6c44a48c9ff3 100644
--- a/remoting/host/fake_desktop_environment.cc
+++ b/remoting/host/fake_desktop_environment.cc
@@ -92,6 +92,10 @@ std::string FakeDesktopEnvironment::GetCapabilities() const {
 
 void FakeDesktopEnvironment::SetCapabilities(const std::string& capabilities) {}
 
+uint32_t FakeDesktopEnvironment::GetDesktopSessionId() const {
+  return UINT32_MAX;
+}
+
 FakeDesktopEnvironmentFactory::FakeDesktopEnvironmentFactory() {}
 FakeDesktopEnvironmentFactory::~FakeDesktopEnvironmentFactory() {}