Check in "current" system API files.

The API files were generated by running "make showcommands update-system-api".

Bug: 18960664
Change-Id: Ibb4756d98be3cbf67f6103f5d5d8ff060b3c34c9
diff --git a/Android.mk b/Android.mk
index dd564557..0ba92cf 100644
--- a/Android.mk
+++ b/Android.mk
@@ -820,6 +820,11 @@
 
 include $(BUILD_DROIDDOC)
 
+# $(gen), i.e. framework.aidl, is also needed while building against the current stub.
+$(full_target): $(framework_built) $(gen)
+$(INTERNAL_PLATFORM_SYSTEM_API_FILE): $(full_target)
+$(call dist-for-goals,sdk,$(INTERNAL_PLATFORM_SYSTEM_API_FILE))
+
 # ====  check javadoc comments but don't generate docs ========
 include $(CLEAR_VARS)