Added google analytics code.

	modificado:     code-samples/mosaicos.html

Author: abaqueiro

code-samples/mosaicos.html

@@ -120,4 +120,15 @@
 selSize.onchange = renderMosaic
 
 </script>
+
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-ELVMWD6W3T"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'G-ELVMWD6W3T');
+</script>
+
 </html>