Revert of Remove supports_touch_events flag from BasicDesktopEnvironment

remoting/host/ipc_desktop_environment.h

Index: remoting/host/ipc_desktop_environment.h
diff --git a/remoting/host/ipc_desktop_environment.h b/remoting/host/ipc_desktop_environment.h
index 7f3186fb2a853cdb6b3142cf436cc5038981ed80..72f0c10a58cb9cfeffddd4244179952f733f6209 100644
--- a/remoting/host/ipc_desktop_environment.h
+++ b/remoting/host/ipc_desktop_environment.h
@@ -44,7 +44,8 @@
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       base::WeakPtr<ClientSessionControl> client_session_control,
       base::WeakPtr<DesktopSessionConnector> desktop_session_connector,
-      bool virtual_terminal);
+      bool virtual_terminal,
+      bool supports_touch_events);
   ~IpcDesktopEnvironment() override;
 
   // DesktopEnvironment implementation.
@@ -98,6 +99,11 @@
       IPC::PlatformFileForTransit desktop_pipe) override;
   void OnTerminalDisconnected(int terminal_id) override;
 
+  // Enables or disables touch events capability.
+  void set_supports_touch_events(bool enable) {
+    supports_touch_events_ = enable;
+  }
+
  private:
   // Used to run the audio capturer.
   scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner_;
@@ -124,6 +130,10 @@
   // allocated every second.
   int next_id_ = 0;
 
+  // Defines whether desktop environments created by this factory will support
+  // touch events by default.
+  bool supports_touch_events_ = false;
+
   // Factory for weak pointers to DesktopSessionConnector interface.
   base::WeakPtrFactory<DesktopSessionConnector> connector_factory_;