[Chromoting] Use device::PowerSaveBlocker to block screen saver

remoting/host/client_session.h

Index: remoting/host/client_session.h
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index 30551ba07708ff8580db3aa02fded8e29dabbf14..64304612109306718481555754ab4d78c0be184b 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -16,6 +16,8 @@
 #include "base/threading/non_thread_safe.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "device/power_save_blocker/power_save_blocker.h"
+#include "remoting/host/chromoting_host_context.h"
 #include "remoting/host/client_session_control.h"
 #include "remoting/host/host_extension_session_manager.h"
 #include "remoting/host/remote_input_filter.h"
@@ -90,8 +92,8 @@ class ClientSession : public base::NonThreadSafe,
 
   // |event_handler| and |desktop_environment_factory| must outlive |this|.
   // All |HostExtension|s in |extensions| must outlive |this|.
-  ClientSession(EventHandler* event_handler,
-                scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
+  ClientSession(const ChromotingHostContext& context,
+                EventHandler* event_handler,
                 std::unique_ptr<protocol::ConnectionToClient> connection,
                 DesktopEnvironmentFactory* desktop_environment_factory,
                 const base::TimeDelta& max_duration,
@@ -244,6 +246,8 @@ class ClientSession : public base::NonThreadSafe,
   // then it's stored in |pending_video_layout_message_|.
   std::unique_ptr<protocol::VideoLayout> pending_video_layout_message_;
 
+  device::PowerSaveBlocker power_save_blocker_;
+
   // Used to disable callbacks to |this| once DisconnectSession() has been
   // called.
   base::WeakPtrFactory<ClientSessionControl> weak_factory_;