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/object.values/shim.js b/node_modules/object.values/shim.js
new file mode 100644
index 0000000..a680e98
--- /dev/null
+++ b/node_modules/object.values/shim.js
@@ -0,0 +1,14 @@
+'use strict';
+
+var getPolyfill = require('./polyfill');
+var define = require('define-properties');
+
+module.exports = function shimValues() {
+	var polyfill = getPolyfill();
+	define(Object, { values: polyfill }, {
+		values: function testValues() {
+			return Object.values !== polyfill;
+		}
+	});
+	return polyfill;
+};