arc: Add cryptohome_id to EmitArcBooted.

chromeos/dbus/fake_session_manager_client.cc

Index: chromeos/dbus/fake_session_manager_client.cc
diff --git a/chromeos/dbus/fake_session_manager_client.cc b/chromeos/dbus/fake_session_manager_client.cc
index 253609d26168a3ac2b4fc64d745c91a57b62e83c..f67f14b49b71add5250d7362edb2541c60b1ebd2 100644
--- a/chromeos/dbus/fake_session_manager_client.cc
+++ b/chromeos/dbus/fake_session_manager_client.cc
@@ -189,7 +189,14 @@ void FakeSessionManagerClient::SetArcCpuRestriction(
       FROM_HERE, base::Bind(callback, arc_available_));
 }
 
-void FakeSessionManagerClient::EmitArcBooted() {}
+void FakeSessionManagerClient::EmitArcBooted(
+    const cryptohome::Identification& cryptohome_id,
+    const ArcCallback& callback) {
+  if (callback.is_null())
+    return;
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(callback, arc_available_));
+}
 
 void FakeSessionManagerClient::GetArcStartTime(
     const GetArcStartTimeCallback& callback) {