Add end-to-end testing of extension-sdk attribute am: dfa3469bc8 am: 1315039986

Original change: https://android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/1608153

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I35c230484a01f831632e2a5c657faf72567dda6e
diff --git a/manifest.json b/manifest.json
index 92194e9..7c089da 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,4 +1,4 @@
 {
   "name": "com.android.sdkext",
-  "version": 300900700
+  "version": 309999900
 }