Expose ClientSession details to Host Extensions

remoting/host/host_mock_objects.h

Index: remoting/host/host_mock_objects.h
diff --git a/remoting/host/host_mock_objects.h b/remoting/host/host_mock_objects.h
index 7b2409258f7fc71a1b1734f7415ba62e0d907aa0..59122043f2e24861cb80c818c442df19ee9310d2 100644
--- a/remoting/host/host_mock_objects.h
+++ b/remoting/host/host_mock_objects.h
@@ -15,6 +15,7 @@
 #include "remoting/host/chromoting_host_context.h"
 #include "remoting/host/client_session.h"
 #include "remoting/host/client_session_control.h"
+#include "remoting/host/client_session_details.h"
 #include "remoting/host/desktop_environment.h"
 #include "remoting/host/host_status_observer.h"
 #include "remoting/host/input_injector.h"
@@ -71,6 +72,17 @@ class MockClientSessionControl : public ClientSessionControl {
   DISALLOW_COPY_AND_ASSIGN(MockClientSessionControl);
 };
 
+class MockClientSessionDetails : public ClientSessionDetails {
+ public:
+  MockClientSessionDetails();
+  ~MockClientSessionDetails() override;
+
+  MOCK_CONST_METHOD0(desktop_session_id, uint32_t());
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockClientSessionDetails);
+};
+
 class MockClientSessionEventHandler : public ClientSession::EventHandler {
  public:
   MockClientSessionEventHandler();