[Android WebView] Make 3rd party licenses checker to turn bot red

build/android/buildbot/buildbot_functions.sh

Index: build/android/buildbot/buildbot_functions.sh
diff --git a/build/android/buildbot/buildbot_functions.sh b/build/android/buildbot/buildbot_functions.sh
index 3a4ca9a7c24316035037e0a85e515ad0c1665308..afc973ba146f8da750d6d6f0f5c55eaac1ce59e6 100755
--- a/build/android/buildbot/buildbot_functions.sh
+++ b/build/android/buildbot/buildbot_functions.sh
@@ -260,16 +260,21 @@ function bb_extract_build {
 }
 
 # Runs the license checker for the WebView build.
+# License checker may return error code 1 meaning that
+# there are non-fatal problems (warnings). Everything
+# above 1 is considered to be a show-stopper.
 function bb_check_webview_licenses {
   echo "@@@BUILD_STEP Check licenses for WebView@@@"
   (
   set +e
   cd "${SRC_ROOT}"
   python android_webview/tools/webview_licenses.py scan
-  if [[ $? -ne 0 ]]; then
+  local licenses_exit_code=$?
+  if [[ $licenses_exit_code -eq 1 ]]; then
     echo "@@@STEP_WARNINGS@@@"
+    return 0
   fi
-  return 0
+  return $licenses_exit_code
   )
 }