Angular $inject userscript.

$inject.user.js

// ==UserScript==
// @name         AngularJS Injector
// @namespace    http://joshkra.me/
// @version      0.1
// @description  Binds $inject method to window
// @author       jkjustjoshing
// @match        *://*/*
// ==/UserScript==

// This userscript creates an $inject() method on the window object that can be used to
// obtain a service reference from the console.
// To install in Chrome, save this file locally. Go to chrome://extensions, and drag-and-drop
// the file in the browser window.

(function() {
  var method = function() {
    var counter = 0;
    var interval = setInterval(function () {
      if(window.angular) {
        bind();
      }
      if(window.angular || counter > 10) {
        clearInterval(interval);
      }
      counter++;
    }, 500);

    function bind () {
      var injector = window.angular.element(document.body).injector();
      window.$inject = function(serviceString) {
        var service = injector.get(serviceString);
        if(!window[serviceString]) {
            window[serviceString] = service;
        }
        return service;
      };
      if (!window.$scope) {
        var elementGetter;
        Object.defineProperty(window, '$scope', {
          configurable: true,
          enumerable: true,
          set: function (element) {
            if (typeof element === 'function') {
              elementGetter = element;
            }
          },
          get: function () {
            if (elementGetter) {
              return window.angular.element(elementGetter()).scope();
            }

            return null;
          }
        });
      }
      var $rootScope = injector.get('$rootScope');
      $rootScope.countWatchers = function () {
        var q = [this], watchers = 0, scope;
        while (q.length > 0) {
            scope = q.pop();
            if (scope.$$watchers) {
                watchers += scope.$$watchers.length;
            }
            if (scope.$$childHead) {
                q.push(scope.$$childHead);
            }
            if (scope.$$nextSibling) {
                q.push(scope.$$nextSibling);
            }
        }
        return watchers;
      };
      var isOn = false, $oldDigest;
      $rootScope.profileDigest = function (_isOn_) {
        if (!isOn && _isOn_) {
          // Turning on
          $oldDigest = $rootScope.$digest;
          $rootScope.$digest = function () {
            console.time('$digest');
            $oldDigest.apply($rootScope);
            console.timeEnd('$digest');
          };
        }
        else if (isOn && !_isOn_) {
          // Turning off
          $rootScope.$digest = $oldDigest;
          $oldDigest = null;
        }

        isOn = _isOn_;
      };

    }
  };

  var script = document.createElement("script");
  script.textContent = "(" + method.toString() + ")();";
  document.body.appendChild(script);
})();