Export Make config vars to Soong to support Droiddoc

export Android.mk config vars to Soong, and export stubs.jar to Make
after compiling Droiddoc from Soong.

Bug: b/70351683
Test: Convert libcore docs Android.mk to Soong manually.

Change-Id: I749b4b3e1e50abce8a757130987c18d7135a3859
diff --git a/core/soong_java_prebuilt.mk b/core/soong_java_prebuilt.mk
index f3ed376..f10da32 100644
--- a/core/soong_java_prebuilt.mk
+++ b/core/soong_java_prebuilt.mk
@@ -23,6 +23,15 @@
 $(eval $(call copy-one-file,$(LOCAL_PREBUILT_MODULE_FILE),$(full_classes_jar)))
 $(eval $(call copy-one-file,$(LOCAL_PREBUILT_MODULE_FILE),$(full_classes_pre_proguard_jar)))
 
+ifdef LOCAL_DROIDDOC_STUBS_JAR
+$(eval $(call copy-one-file,$(LOCAL_DROIDDOC_STUBS_JAR),$(OUT_DOCS)/$(LOCAL_MODULE)-stubs.jar))
+ALL_DOCS += $(OUT_DOCS)/$(LOCAL_MODULE)-stubs.jar
+endif
+
+ifdef LOCAL_DROIDDOC_DOC_ZIP
+$(eval $(call copy-one-file,$(LOCAL_DROIDDOC_DOC_ZIP),$(OUT_DOCS)/$(LOCAL_MODULE)-docs.zip))
+endif
+
 ifdef LOCAL_SOONG_JACOCO_REPORT_CLASSES_JAR
   $(eval $(call copy-one-file,$(LOCAL_SOONG_JACOCO_REPORT_CLASSES_JAR),\
     $(intermediates.COMMON)/jacoco-report-classes.jar))