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

remoting/host/chromoting_host.h

Index: remoting/host/chromoting_host.h
diff --git a/remoting/host/chromoting_host.h b/remoting/host/chromoting_host.h
index 5186988f0b9eda0052080b9df28fe84248b003e5..557f3ec10fcd0abfeca5d407120b59065c6a0180 100644
--- a/remoting/host/chromoting_host.h
+++ b/remoting/host/chromoting_host.h
@@ -17,6 +17,7 @@
 #include "base/threading/non_thread_safe.h"
 #include "base/threading/thread.h"
 #include "net/base/backoff_entry.h"
+#include "remoting/host/chromoting_host_context.h"
 #include "remoting/host/client_session.h"
 #include "remoting/host/host_extension.h"
 #include "remoting/host/host_status_monitor.h"
@@ -71,8 +72,7 @@ class ChromotingHost : public base::NonThreadSafe,
       DesktopEnvironmentFactory* desktop_environment_factory,
       std::unique_ptr<protocol::SessionManager> session_manager,
       scoped_refptr<protocol::TransportContext> transport_context,
-      scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner);
+      const ChromotingHostContext& context);
   ~ChromotingHost() override;
 
   // Asynchronously starts the host.
@@ -155,8 +155,7 @@ class ChromotingHost : public base::NonThreadSafe,
   DesktopEnvironmentFactory* desktop_environment_factory_;
   std::unique_ptr<protocol::SessionManager> session_manager_;
   scoped_refptr<protocol::TransportContext> transport_context_;
-  scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner_;
-  scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner_;
+  std::unique_ptr<ChromotingHostContext> context_;
 
   // Must be used on the network thread only.
   base::ObserverList<HostStatusObserver> status_observers_;