gn2bp: Add required file to tool_files

Test: ./update_results.sh
Change-Id: I85f17cfd0c9c636de4d0937c2a38e091bd0afe8c
diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 495e460..47606a8 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -2620,6 +2620,7 @@
     ],
     tool_files: [
         "build/util/LASTCHANGE",
+        "build/util/android_chrome_version.py",
         "build/util/version.py",
         "chrome/VERSION",
         "components/cronet/version.h.in",