Check desugared library implementation when generating lint files

Bug: 171971176
Change-Id: Idaf4b089fb2bfcf0b091693455a4ad37b716a5ec
diff --git a/tools/utils.py b/tools/utils.py
index 3aad6c4..96708d2 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -56,6 +56,8 @@
 
 DESUGAR_CONFIGURATION = os.path.join(
       'src', 'library_desugar', 'desugar_jdk_libs.json')
+DESUGAR_IMPLEMENTATION = os.path.join(
+      'third_party', 'openjdk', 'desugar_jdk_libs', 'libjava.jar')
 DESUGAR_CONFIGURATION_MAVEN_ZIP = os.path.join(
   LIBS, 'desugar_jdk_libs_configuration.zip')
 GENERATED_LICENSE = os.path.join(GENERATED_LICENSE_DIR, 'LICENSE')