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..183ebc0b8aa4abf73827b019d82bb0b5547ac78b 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";
@@ -33,6 +34,9 @@ interface ArcBridgeHost {
 
   // Notifies Chrome that the SettingsInstance interface is ready.
   OnSettingsInstanceReady@105(SettingsInstance instance_ptr);
+
+  // Notifies Chrome that the AuthInstance interface is ready.
+  OnAuthInstanceReady@106(AuthInstance instance_ptr);

[Luis Héctor Chávez, 2015/12/30 00:02:37]

[MinVersion=1] (but if https://codereview.chromium.org/1451353002/ or
https://codereview.chromium.org/1495723004/ land first, you'd need to update
accordingly).

Also, sort alphabetically.

[victorhsieh, 2015/12/30 00:32:34]

Done.

 };
 
 interface ArcBridgeInstance {