Details stats for the new tab page addon

Ghostery Dawn New Tab Page is going to show WTM popup with number of trackers blocked grouped by category. Fortunately commons `insight` module already provide all required information.

src/background.js

@@ -1416,6 +1416,12 @@ function initializeEventListeners() {
 				getDataForGhosteryTab(data => sendResponse({ historicalDataAndSettings: data }));
 				return true;
 			}
+
+			if (recognized && request.name === 'getDashboardStats') {
+				insights.action('getDashboardStats', ...(request.args || [])).then(sendResponse);
+				return true;
+			}
+
 			return false;
 		});
 	}