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 36fd5d076aedcfb4ec5a5cdd806061995c25d9b3..64bd2bf619975ea9843611fc28b64e426efe25d0 100644
--- a/components/arc/arc_bridge_service.h
+++ b/components/arc/arc_bridge_service.h
@@ -119,6 +119,7 @@ class ArcBridgeService {
   InstanceHolder<mojom::StorageManagerInstance>* storage_manager() {
     return &storage_manager_;
   }
+  InstanceHolder<mojom::TtsInstance>* tts() { return &tts_; }
   InstanceHolder<mojom::VideoInstance>* video() { return &video_; }
   InstanceHolder<mojom::WindowManagerInstance>* window_manager() {
     return &window_manager_;
@@ -190,6 +191,7 @@ class ArcBridgeService {
   InstanceHolder<mojom::PowerInstance> power_;
   InstanceHolder<mojom::ProcessInstance> process_;
   InstanceHolder<mojom::StorageManagerInstance> storage_manager_;
+  InstanceHolder<mojom::TtsInstance> tts_;
   InstanceHolder<mojom::VideoInstance> video_;
   InstanceHolder<mojom::WindowManagerInstance> window_manager_;