gn2bp: Add _sanitize_args to JavaCppFeatureSanitier

Test: m cronet_aml_base_java_features_srcjar
Change-Id: I465d2c18890ac2f4b749b4e8cee50dc869766dad
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 9a486a8..2ce694b 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -902,7 +902,10 @@
     return True
 
 class JavaCppFeatureSanitizer(BaseActionSanitizer):
-  pass
+  def _sanitize_args(self):
+    self._update_all_args(self._sanitize_filepath_with_location_tag)
+    self._set_value_arg('--srcjar', '$(out)')
+    super()._sanitize_args()
 
 def get_action_sanitizer(target, type):
   if target.script == "//build/write_buildflag_header.py":