Added timer to explore v2 and share it with sqllab (#1802)

* Added timer to explore v2 and share it with sqllab

* Fixed js tests

* Add timer to initial load

* Make timer smaller

* nits

superset/assets/spec/javascripts/sqllab/Timer_spec.jsx

@@ -1,14 +1,17 @@
 import React from 'react';
-import Timer from '../../../javascripts/SqlLab/components/Timer';
+import Timer from '../../../javascripts/components/Timer';
 import { shallow } from 'enzyme';
 import { describe, it } from 'mocha';
 import { expect } from 'chai';
-import { queries } from './fixtures';
+import { now } from '../../../javascripts/modules/dates';
 
 
 describe('Timer', () => {
   const mockedProps = {
-    query: queries[0],
+    startTime: now(),
+    endTime: null,
+    isRunning: true,
+    state: 'warning',
   };
   it('renders', () => {
     expect(React.isValidElement(<Timer />)).to.equal(true);