Show found redux tab instead of last tab for Electron test

also add 5 attempts for find Redux tab

test/electron/devpanel.spec.js

@@ -22,6 +22,7 @@ describe('DevTools panel for Electron', function() {
       })
       .forBrowser('electron')
       .build();
+    await this.driver.manage().timeouts().setScriptTimeout(10000);
   });
 
   after(async () => {
@@ -34,11 +35,23 @@ describe('DevTools panel for Electron', function() {
 
     await this.driver.manage().timeouts().pageLoadTimeout(5000);
 
-    const id = await this.driver.executeScript(function() {
-      const tabs = WebInspector.inspectorView._tabbedPane._tabs;
-      const lastPanelId = tabs[tabs.length - 1].id;
-      WebInspector.inspectorView.showPanel(lastPanelId);
-      return lastPanelId;
+    const id = await this.driver.executeAsyncScript(function(callback) {
+      let attempts = 5;
+      function showReduxPanel() {
+        if (attempts === 0) {
+          return callback('Redux panel not found');
+        }
+        const tabs = WebInspector.inspectorView._tabbedPane._tabs;
+        const idList = tabs.map(tab => tab.id);
+        const reduxPanelId = 'chrome-extension://redux-devtoolsRedux';
+        if (idList.indexOf(reduxPanelId) !== -1) {
+          WebInspector.inspectorView.showPanel(reduxPanelId);
+          return callback(reduxPanelId);
+        }
+        attempts--;
+        setTimeout(showReduxPanel, 500);
+      }
+      showReduxPanel();
     });
     expect(id).toBe('chrome-extension://redux-devtoolsRedux');