function injectPolyfills(dataModel) {
    Object.keys(polyfills).forEach(function(key) {
        if (!dataModel[key]) {
            dataModel[key] = polyfills[key];
        }
    });
}
Injects missing utility functions into the data model.

Typically, data models are extended from `datasaur-base` which supplies the utility functions. However, extending from `datasaur-base` is not a requirement and for those data models that do not, the necessary utility functions are injected here.

The only utility function so injected at this time is `install`, which is used by:
* {@link module:decorators.injectCode injectCode} to:
   * Inject fallbacks for missing non-essential data model methods
   * Bind the data model's `dispatchEvent` method to the grid instance
* {@link module:decorators.injectDefaulthooks injectDefaulthooks} to:
   * Inject a default for the `getCell` hook
   * Inject a default for the `getCellEditorAt` hook

@this {Local}
@param {DataModel} dataModel
@memberOf module:decorators