Host side implementation of ARC tts.

components/arc/arc_bridge_service.h

Index: components/arc/arc_bridge_service.h
diff --git a/components/arc/arc_bridge_service.h b/components/arc/arc_bridge_service.h
index cef59e72a18888659d727604910e47cede0b3d2f..fbcdb8bad96b8643b532ced1722220e62a376096 100644
--- a/components/arc/arc_bridge_service.h
+++ b/components/arc/arc_bridge_service.h
@@ -114,6 +114,7 @@ class ArcBridgeService {
   InstanceHolder<mojom::StorageManagerInstance>* storage_manager() {
     return &storage_manager_;
   }
+  InstanceHolder<mojom::TtsInstance>* tts() { return &tts_; }
   InstanceHolder<mojom::VideoInstance>* video() { return &video_; }
 
   // Gets if ARC is currently running.
@@ -180,6 +181,7 @@ class ArcBridgeService {
   InstanceHolder<mojom::PowerInstance> power_;
   InstanceHolder<mojom::ProcessInstance> process_;
   InstanceHolder<mojom::StorageManagerInstance> storage_manager_;
+  InstanceHolder<mojom::TtsInstance> tts_;
   InstanceHolder<mojom::VideoInstance> video_;
 
   // Gets the current state of the bridge service.