Hosting the discardable memory service in the mus process

ui/views/mus/mus_client.h

Index: ui/views/mus/mus_client.h
diff --git a/ui/views/mus/mus_client.h b/ui/views/mus/mus_client.h
index ebb84df3e76eed24b0b1601cf7e1802cdf0fb514..34b2c33d1382698f2d4b398c2465dffeda0feb01 100644
--- a/ui/views/mus/mus_client.h
+++ b/ui/views/mus/mus_client.h
@@ -27,6 +27,11 @@ class WindowTreeClient;
 
 namespace base {
 class SingleThreadTaskRunner;
+class Thread;
+}
+
+namespace discardable_memory {
+class ClientDiscardableSharedMemoryManager;
 }
 
 namespace service_manager {
@@ -132,6 +137,8 @@ class VIEWS_MUS_EXPORT MusClient
 
   service_manager::Identity identity_;
 
+  std::unique_ptr<base::Thread> io_thread_;
+
   base::ObserverList<MusClientObserver> observer_list_;
 
   // NOTE: this may be null (creation is based on argument supplied to
@@ -150,6 +157,9 @@ class VIEWS_MUS_EXPORT MusClient
 
   std::unique_ptr<aura::MusContextFactory> compositor_context_factory_;
 
+  std::unique_ptr<discardable_memory::ClientDiscardableSharedMemoryManager>
+      discardable_shared_memory_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(MusClient);
 };