[Chromoting] Use HostExperimentSessionPlugin in host

remoting/host/desktop_environment_options.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/desktop_environment_options.h"
 
+#include <string>
 #include <utility>
 
+#include "base/optional.h"
+
 namespace remoting {
 
 using DesktopCaptureOptions = webrtc::DesktopCaptureOptions;
 
 // static
 DesktopEnvironmentOptions DesktopEnvironmentOptions::CreateDefault() {
   DesktopEnvironmentOptions options;
   options.desktop_capture_options_ = DesktopCaptureOptions::CreateDefault();
   options.Initialize();
   return options;
@@ skipping 42 matching lines @@
 }
 
 bool DesktopEnvironmentOptions::enable_user_interface() const {
   return enable_user_interface_;
 }
 
 void DesktopEnvironmentOptions::set_enable_user_interface(bool enabled) {
   enable_user_interface_ = enabled;
 }
 
+void DesktopEnvironmentOptions::ApplyHostSessionOptions(
+    const HostSessionOptions& options) {
+#if defined(OS_WIN)
+  base::Optional<std::string> directx_capturer =
+      options.Get("DirectX-Capturer");
+  if (directx_capturer) {
+    desktop_capture_options_.set_allow_directx_capturer(
+        *directx_capturer == "true");
+  }
+#endif
+  // This field is for test purpose. Usually it should not be set to false.
+  base::Optional<std::string> detect_updated_region =
+      options.Get("Detect-Updated-Region");
+  if (detect_updated_region) {
+    desktop_capture_options_.set_detect_updated_region(
+        *detect_updated_region == "true");
+  }
+}
+
 }  // namespace remoting