Add templates for devsite docs builds.

Change-Id: I0bb0238326aed7d2ff931594709cb153b2587061
diff --git a/tools/droiddoc/templates-ds/header_tabs.cs b/tools/droiddoc/templates-ds/header_tabs.cs
new file mode 100644
index 0000000..38c9da8
--- /dev/null
+++ b/tools/droiddoc/templates-ds/header_tabs.cs
@@ -0,0 +1,2 @@
+
+<!-- CURRENTLY NOT USED... ALL TABS ARE IN masthead.cs -->