WebUI: Experimenting with ESLint, WIP.

chrome/browser/resources/.eslintrc.js

Index: chrome/browser/resources/.eslintrc.js
diff --git a/chrome/browser/resources/.eslintrc.js b/chrome/browser/resources/.eslintrc.js
new file mode 100644
index 0000000000000000000000000000000000000000..44202524d0d788a4d9feea46aa114c6fc6e666df
--- /dev/null
+++ b/chrome/browser/resources/.eslintrc.js
@@ -0,0 +1,29 @@
+module.exports = {
+  'env': {
+    'browser': true,
+    'es6': true
+  },
+  'extends': 'eslint:recommended',
+  'rules': {
+    // Disabled checks.
+    'no-case-declarations': 'off',
+    'no-dupe-keys': 'off',
+    'no-extra-boolean-cast': 'off',
+    'no-inner-declarations': 'off',
+    'no-redeclare': 'off',
+    'no-undef': 'off',
+    'no-unused-vars': 'off',
+    'no-useless-escape': 'off',
+
+    // Enabled checks.
+    'comma-dangle': ['error', 'only-multiline'],
+    'linebreak-style': ['error', 'unix'],
+    'max-len': ['error', 80],
+    'no-console': ['error', { allow: ['warn', 'error'] }],
+    'no-constant-condition': ['error', {checkLoops: false}],
+    'no-trailing-spaces': 'error',
+    'object-curly-spacing': ['error', 'never'],
+    'quotes': ['error', 'single', {avoidEscape: true}],
+    'semi': ['error', 'always'],
+  }
+};