Adds license checker

This CL adds license-checker to manage_node_deps.

Change-Id: Ia525e9c2380fc2654e9903ecc7fd4e94cdce1f9a
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1944866
Auto-Submit: Paul Lewis <aerotwist@chromium.org>
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
diff --git a/scripts/devtools_paths.py b/scripts/devtools_paths.py
index 39386ff..1f89917 100644
--- a/scripts/devtools_paths.py
+++ b/scripts/devtools_paths.py
@@ -69,6 +69,10 @@
     return path.join(node_modules_path(), 'karma', 'bin', 'karma')
 
 
+def license_checker_path():
+    return path.join(node_modules_path(), 'license-checker', 'bin', 'license-checker')
+
+
 def rollup_path():
     return path.join(
         node_modules_path(),