[Chromoting] Use HostExperimentSessionPlugin in host

remoting/host/desktop_environment_options.h

Index: remoting/host/desktop_environment_options.h
diff --git a/remoting/host/desktop_environment_options.h b/remoting/host/desktop_environment_options.h
index 31044c64bb14952dee1a355c28fa4c11b95d5c11..15cacfa8125c4d539e40f7a290157f6dd29b93ca 100644
--- a/remoting/host/desktop_environment_options.h
+++ b/remoting/host/desktop_environment_options.h
@@ -8,12 +8,9 @@
 #include <memory>
 
 #include "base/memory/weak_ptr.h"
+#include "remoting/host/host_session_options.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capture_options.h"
 
-namespace webrtc {
-class DesktopCaptureOptions;
-}  // namespace webrtc
-
 namespace remoting {
 
 // A container of options a DesktopEnvironment or its derived classes need to
@@ -42,6 +39,9 @@ class DesktopEnvironmentOptions final {
   const webrtc::DesktopCaptureOptions* desktop_capture_options() const;
   webrtc::DesktopCaptureOptions* desktop_capture_options();
 
+  // Reads configurations from a HostSessionOptions instance.
+  void ApplyHostSessionOptions(const HostSessionOptions& options);
+
  private:
   // Sets default values for default constructor and CreateDefault() function.
   void Initialize();