Host side implementation of ARC tts.

components/arc/common/arc_bridge.mojom

Index: components/arc/common/arc_bridge.mojom
diff --git a/components/arc/common/arc_bridge.mojom b/components/arc/common/arc_bridge.mojom
index 105c19b155b76e3c39436ac530e9dcaddcbb81c7..bdf4d48086481b3b8e881f83b65b3ea7f0e3ca82 100644
--- a/components/arc/common/arc_bridge.mojom
+++ b/components/arc/common/arc_bridge.mojom
@@ -22,11 +22,12 @@ import "policy.mojom";
 import "power.mojom";
 import "process.mojom";
 import "storage_manager.mojom";
+import "tts.mojom";
 import "video.mojom";
 
-// Next MinVersion: 16
+// Next MinVersion: 17
 // Deprecated method IDs: 101, 105
-// Next method ID: 123
+// Next method ID: 124
 interface ArcBridgeHost {
   // Keep the entries alphabetical. In order to do so without breaking
   // compatibility with the ARC instance, explicitly assign each interface a
@@ -90,6 +91,9 @@ interface ArcBridgeHost {
   // Notifies Chrome that the StorageManagerInstance interface is ready.
   [MinVersion=12] OnStorageManagerInstanceReady@118(StorageManagerInstance instance_ptr);
 
+  // Notifies Chrome that the TtsInstance interface is ready.
+  [MinVersion=16] OnTtsInstanceReady@123(TtsInstance instance_ptr);
+
   // Notifies Chrome that the VideoInstance interface is ready.
   [MinVersion=6] OnVideoInstanceReady@107(VideoInstance instance_ptr);
 };