Add eslint-import-plugin to node_modules

Will be used to make sure no default exports are in DevTools.

The PRESUBMIT.py has been updated to skip running the formatting check
if node_modules files are affected, to workaround crbug.com/1068198.

DISABLE_THIRD_PARTY_CHECK=Add plugin to node_modules

Bug: 1068198
Change-Id: I04d4dc813daa01099f21d40edf47aaefcc0b045f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2135610
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
diff --git a/node_modules/eslint-module-utils/declaredScope.js b/node_modules/eslint-module-utils/declaredScope.js
new file mode 100644
index 0000000..904279a
--- /dev/null
+++ b/node_modules/eslint-module-utils/declaredScope.js
@@ -0,0 +1,14 @@
+'use strict'
+exports.__esModule = true
+
+exports.default = function declaredScope(context, name) {
+  let references = context.getScope().references
+    , i
+  for (i = 0; i < references.length; i++) {
+    if (references[i].identifier.name === name) {
+      break
+    }
+  }
+  if (!references[i]) return undefined
+  return references[i].resolved.scope.type
+}