[Chromoting] Use HostExperimentSessionPlugin in host

remoting/host/desktop_environment_options.cc

Index: remoting/host/desktop_environment_options.cc
diff --git a/remoting/host/desktop_environment_options.cc b/remoting/host/desktop_environment_options.cc
index 716142c760edfa49fd39d77088676f1b99b0392d..af4c8fe069b64647d1e591cd0f5ac53bdac31910 100644
--- a/remoting/host/desktop_environment_options.cc
+++ b/remoting/host/desktop_environment_options.cc
@@ -4,8 +4,11 @@
 
 #include "remoting/host/desktop_environment_options.h"
 
+#include <string>
 #include <utility>
 
+#include "base/optional.h"
+
 namespace remoting {
 
 using DesktopCaptureOptions = webrtc::DesktopCaptureOptions;
@@ -64,4 +67,13 @@ void DesktopEnvironmentOptions::set_enable_user_interface(bool enabled) {
   enable_user_interface_ = enabled;
 }
 
+void DesktopEnvironmentOptions::Import(const HostSessionOptions& options) {
+#if defined(OS_WIN)
+  base::Optional<std::string> result = options.Get("DirectX-Capturer");
+  if (result) {
+    desktop_capture_options_.set_allow_directx_capturer(*result == "true");
+  }
+#endif
+}
+
 }  // namespace remoting