Output dex_preopt to SDK snapshot.

This is needed to determine whether we need to deapex the profile or
not.

Bug: 241823638
Test: m nothing
Test: -
  1. Patch ag/20582608 PS2.
  2. TARGET_BUILD_APPS=com.android.wifi packages/modules/common/build/mainline_modules_sdks.sh
  3. See the `dex_preopt` property being written.
Change-Id: I05177388c24be1ab315247ea85e7e3a8600cebd3
diff --git a/sdk/java_sdk_test.go b/sdk/java_sdk_test.go
index 2ade146..3a2ecc0 100644
--- a/sdk/java_sdk_test.go
+++ b/sdk/java_sdk_test.go
@@ -33,7 +33,8 @@
 
 	// Files needs by most of the tests.
 	android.MockFS{
-		"Test.java": nil,
+		"Test.java":   nil,
+		"art-profile": nil,
 	}.AddToFixture(),
 )