Fix root path detection

Bug: none
Change-Id: I5834aa987d8f46f2c7042c79f501e0eb9503ed96
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3045708
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
diff --git a/scripts/devtools_paths.py b/scripts/devtools_paths.py
index 22e6599..2fa6a90 100644
--- a/scripts/devtools_paths.py
+++ b/scripts/devtools_paths.py
@@ -22,7 +22,8 @@
     if path.basename(PARENT_PATH) == 'renderer':
         # Chromium repository
         return path.dirname(path.dirname(path.dirname(PARENT_PATH)))
-    elif path.basename(PARENT_PATH) == 'devtools-frontend':
+    elif path.basename(PARENT_PATH) == 'devtools-frontend' or path.basename(
+            PARENT_PATH) == 'devtools-frontend-internal':
         # External repository, integrated build
         return path.dirname(path.dirname(PARENT_PATH))
     else: