Add data binding to built javadoc.

Bug 22175560

Change-Id: Ie57e0b77cade4b994ca2ef80cbf1a4c615a943f8
diff --git a/Android.mk b/Android.mk
index e96a932..6015146 100644
--- a/Android.mk
+++ b/Android.mk
@@ -667,7 +667,8 @@
 # FRAMEWORKS_BASE_SUBDIRS comes from build/core/pathmap.mk
 dirs_to_document := \
 	$(dirs_to_check_apis) \
-  $(addprefix ../../, $(FRAMEWORKS_SUPPORT_JAVA_SRC_DIRS))
+  $(addprefix ../../, $(FRAMEWORKS_DATA_BINDING_JAVA_SRC_DIRS)) \
+  $(addprefix ../../, $(FRAMEWORKS_SUPPORT_JAVA_SRC_DIRS)) \
 
 # These are relative to frameworks/base
 html_dirs := \