docs: add css for Android Design links and add link to site header

Change-Id: I0a9469519076b1c5b9d7c121df1f2c731a08d2cb
diff --git a/tools/droiddoc/templates-sdk/components/masthead.cs b/tools/droiddoc/templates-sdk/components/masthead.cs
index e521489..5910107 100644
--- a/tools/droiddoc/templates-sdk/components/masthead.cs
+++ b/tools/droiddoc/templates-sdk/components/masthead.cs
@@ -28,7 +28,8 @@
              	   //-->
              	</script>
             </span>
-          <?cs /if ?>
+          <?cs /if ?>&nbsp;&nbsp;
+          <a href="<?cs var:toroot ?>design/index.html">Android Design</a>&nbsp;&nbsp;
           <a href="http://www.android.com">Android.com</a>
           </div><?cs 
           call:default_search_box() ?><?cs