AI 149267: Add the images for icon guidelines doc
  BUG=1790234

Automated import of CL 149267
diff --git a/docs/html/robots.txt b/docs/html/robots.txt
index 085b79d..7046373 100644
--- a/docs/html/robots.txt
+++ b/docs/html/robots.txt
@@ -1,7 +1,8 @@
-User-Agent: *

-Allow: /

-Disallow: /gae_shell/

-Disallow: /assets/

-Disallow: /images/

-Disallow: /sdk/preview/

-Sitemap: http://developer.android.com/sitemap.txt

+User-Agent: *
+Allow: /
+Disallow: /gae_shell/
+Disallow: /assets/
+Disallow: /images/
+Disallow: /sdk/preview/
+Disallow: /shareables/
+Sitemap: http://developer.android.com/sitemap.txt