add missing java/*_test.go files

fuzz_test.go is not included for now because there is a fix in progress
to make tests pass again.

Test: go test ./java
Change-Id: Idd44fb95c1dda728659ebfc58381252ab49c8230

java/Android.bp

@@ -87,6 +87,7 @@ bootstrap_go_package {
         "dexpreopt_bootjars_test.go",
         "droiddoc_test.go",
         "droidstubs_test.go",
+        "genrule_test.go",
         "hiddenapi_singleton_test.go",
         "jacoco_test.go",
         "java_test.go",
@@ -97,6 +98,7 @@ bootstrap_go_package {
         "platform_compat_config_test.go",
         "plugin_test.go",
         "prebuilt_apis_test.go",
+        "proto_test.go",
         "rro_test.go",
         "sdk_test.go",
         "sdk_library_test.go",