Add ArcAuthService to handle IPC request from ARC

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 af98bb1bee3a629026111de63436e2cca84febde..1ccd0b79b528ecabb5dd0fa15d3f75b4e4d6e489 100644
--- a/components/arc/common/arc_bridge.mojom
+++ b/components/arc/common/arc_bridge.mojom
@@ -5,6 +5,7 @@
 module arc;
 
 import "app.mojom";
+import "auth.mojom";
 import "input.mojom";
 import "notifications.mojom";
 import "power.mojom";
@@ -19,6 +20,9 @@ interface ArcBridgeHost {
   // Notifies Chrome that the AppInstance interface is ready.
   OnAppInstanceReady@100(AppInstance instance_ptr);
 
+  // Notifies Chrome that the AuthInstance interface is ready.
+  [MinVersion=1] OnAuthInstanceReady@106(AuthInstance instance_ptr);
+
   // Notifies Chrome that the InputInstnace interface is ready.
   OnInputInstanceReady@101(InputInstance instance_ptr);