Support to run DroidDoc in unbundled builds.

Change-Id: Ia5ace10ed75c451e346e289f0c534ad619abdb65
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index 91d8166..47f599d 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -63,9 +63,17 @@
 
 ifneq ($(LOCAL_IS_HOST_MODULE),true)
 
-ifeq ($(LOCAL_JAVA_LIBRARIES),)
-LOCAL_JAVA_LIBRARIES := core ext framework
-endif
+ifneq ($(LOCAL_SDK_VERSION),)
+  ifeq ($(LOCAL_SDK_VERSION),current)
+    LOCAL_JAVA_LIBRARIES := android_stubs_current $(LOCAL_JAVA_LIBRARIES)
+  else
+    LOCAL_JAVA_LIBRARIES := sdk_v$(LOCAL_SDK_VERSION) $(LOCAL_JAVA_LIBRARIES)
+  endif
+else
+  LOCAL_JAVA_LIBRARIES := core ext framework $(LOCAL_JAVA_LIBRARIES)
+endif  # LOCAL_SDK_VERSION
+LOCAL_JAVA_LIBRARIES := $(sort $(LOCAL_JAVA_LIBRARIES))
+
 full_java_libs := $(call java-lib-files,$(LOCAL_JAVA_LIBRARIES),$(LOCAL_IS_HOST_MODULE))
 full_java_lib_deps := $(call java-lib-deps,$(LOCAL_JAVA_LIBRARIES),$(LOCAL_IS_HOST_MODULE))