Add stubs needed to enable javac to compile lambdas

This enables framework.jar code to include lambdas.
framework.jar is still built with javac (as well as
jack) for things like doclava.

Bug: 26753820
(cherry picked from commit 801f90e61b971984c92767acd6fb62d56911664b)

Change-Id: Icdc9e003b09bd1e14e991b32934b3c4c4a268b1a
diff --git a/Android.mk b/Android.mk
index a94414d..731440f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -426,7 +426,7 @@
 			$(framework_res_source_path)/com/android/internal/R.java
 
 LOCAL_NO_STANDARD_LIBRARIES := true
-LOCAL_JAVA_LIBRARIES := core-oj core-libart conscrypt okhttp core-junit bouncycastle ext
+LOCAL_JAVA_LIBRARIES := core-oj core-libart core-lambda-stubs conscrypt okhttp core-junit bouncycastle ext
 
 LOCAL_MODULE := framework