Bug 1170804 - Add .eslintrc configuration file to mobile/android. r=margaret

eslint can be run by `cd`ing to mobile/android and running `eslint .` (assuming
eslint is installed). Note that .jsm files have not yet been configured.

Add an eslintignore to avoid the files that will take more work.

--HG--
extra : commitid : LcrYaNh2sSn
extra : rebase_source : 43a2b1988049003b1e225fa60671a04f62c3d44a

mobile/android/.eslintignore

@@ -0,0 +1,9 @@
+chrome/content
+tests/
+
+# Uses `#filter substitution`
+app/mobile.js
+
+# Not much JS to lint and non-standard at that
+installer/
+locales/

mobile/android/.eslintrc

@@ -0,0 +1,101 @@
+env:
+    browser: true
+    es6: true
+
+globals:
+    Components: false
+
+    # TODO: Create custom rule for `Cu.import`
+    AddonManager: false
+    AppConstants: false
+    Downloads: false
+    File: false
+    FileUtils: false
+    HelperApps: false
+    JNI: false
+    Messaging: false
+    OS: false
+    PrivateBrowsingUtils: false
+    Prompt: false
+    Services: false
+    Task: false
+    TelemetryStopwatch: false
+    UserAgentOverrides: 0
+    WebappManager: false
+    XPCOMUtils: false
+    dump: false
+    exports: false
+    importScripts: false
+    require: false
+
+    Iterator: false # TODO: Remove - deprecated!
+
+rules:
+    global-strict: 0 # Overridden by "strict"
+    no-underscore-dangle: 0 # We allow trailing underscores in names.
+
+    # We disable everything to get all files to pass w/o updating them.
+    # We'll re-enable one by one.
+    camelcase: 0
+    comma-dangle: 0
+    consistent-return: 0
+    curly: 0
+    dot-notation: 0
+    eqeqeq: 0
+    key-spacing: 0
+    new-cap: 0
+    no-constant-condition: 0
+    no-extra-semi: 0
+    no-caller: 0
+    no-return-assign: 0
+    no-extra-bind: 0
+    no-empty: 0
+    no-multi-spaces: 0
+    no-loop-func: 0
+    no-new-object: 0
+    no-octal: 0
+    no-shadow: 0
+    no-trailing-spaces: 0
+    no-use-before-define: 0
+    no-unused-vars: 0
+    quotes: 0 # [2, "double"]
+    semi: 0
+    space-infix-ops: 0
+    space-unary-ops: 0 # 2: https://github.com/eslint/eslint/issues/2764
+    strict: 0
+
+  #"ecmaFeatures": {
+  #  "forOf": true,
+  #  "jsx": true,
+  #},
+  #"rules": {
+  #  // turn off all kinds of stuff that we actually do want, because
+  #  // right now, we're bootstrapping the linting infrastructure.  We'll
+  #  // want to audit these rules, and start turning them on and fixing the
+  #  // problems they find, one at a time.
+
+  #  // Eslint built-in rules are documented at <http://eslint.org/docs/rules/>
+  #  "camelcase": 0,               // TODO: Remove (use default)
+  #  "consistent-return": 0,       // TODO: Remove (use default)
+  #  dot-location: 0,              // [2, property],
+  #  "eqeqeq": 0,                  // TBD. Might need to be separate for content & chrome
+  #  "global-strict": 0,           // Leave as zero (this will be unsupported in eslint 1.0.0)
+  #  "linebreak-style": [2, "unix"],
+  #  "new-cap": 0,                 // TODO: Remove (use default)
+  #  "no-catch-shadow": 0,         // TODO: Remove (use default)
+  #  "no-console": 0,              // Leave as 0. We use console logging in content code.
+  #  "no-empty": 0,                // TODO: Remove (use default)
+  #  "no-extra-bind": 0,           // Leave as 0
+  #  "no-extra-boolean-cast": 0,   // TODO: Remove (use default)
+  #  "no-multi-spaces": 0,         // TBD.
+  #  "no-new": 0,                  // TODO: Remove (use default)
+  #  "no-redeclare": 0,            // TODO: Remove (use default)
+  #  "no-return-assign": 0,        // TODO: Remove (use default)
+  #  "no-underscore-dangle": 0,    // Leave as 0. Commonly used for private variables.
+  #  "no-unneeded-ternary": 2,
+  #  "no-unused-expressions": 0,   // TODO: Remove (use default)
+  #  "no-unused-vars": 0,          // TODO: Remove (use default)
+  #  "no-use-before-define": 0,    // TODO: Remove (use default)
+  #  "quotes": [2, "double", "avoid-escape"],
+  #  "strict": 0,                  // [2, "function"],
+  #}