implement keyguardGoingAway() fixes build.

Fix bug 15326529.

Change-Id: I9095fe70721bfb031dd1080da1d61ff4e1a8c8ab
diff --git a/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java b/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java
index e1a9719..3bf2b20 100644
--- a/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java
+++ b/tools/layoutlib/bridge/src/android/view/IWindowManagerImpl.java
@@ -439,6 +439,10 @@
     }
 
     @Override
+    public void keyguardGoingAway() throws RemoteException {
+    }
+
+    @Override
     public void lockNow(Bundle options) {
         // TODO Auto-generated method stub
     }