DECKGL integration - Phase 1 (#3771)

* DECKGL integration

Adding a new set of geospatial visualizations building on top of the
awesome deck.gl library. https://github.com/uber/deck.gl

While the end goal it to expose all types of layers and let users bind
their data to control most props exposed by the deck.gl API, this
PR focusses on a first set of visualizations and props:

* ScatterLayer
* HexagonLayer
* GridLayer
* ScreenGridLayer

* Addressing comments

* lint

* Linting

* Addressing chri's comments

superset/assets/javascripts/explore/components/controls/TextControl.jsx

@@ -5,10 +5,8 @@ import * as v from '../../validators';
 import ControlHeader from '../ControlHeader';
 
 const propTypes = {
-  name: PropTypes.string.isRequired,
-  label: PropTypes.string,
-  description: PropTypes.string,
   onChange: PropTypes.func,
+  onFocus: PropTypes.func,
   value: PropTypes.oneOfType([
     PropTypes.string,
     PropTypes.number,
@@ -18,9 +16,8 @@ const propTypes = {
 };
 
 const defaultProps = {
-  label: null,
-  description: null,
   onChange: () => {},
+  onFocus: () => {},
   value: '',
   isInt: false,
   isFloat: false,
@@ -64,6 +61,7 @@ export default class TextControl extends React.Component {
             type="text"
             placeholder=""
             onChange={this.onChange}
+            onFocus={this.props.onFocus}
             value={value}
           />
         </FormGroup>