add butterbar for L announcement.
make the butterbar an encapsulated method for inclusion multiple places.

Change-Id: I7716bd293372dcf88cd0bd57fb399d01bfa897a0
diff --git a/tools/droiddoc/templates-sdk/components/masthead.cs b/tools/droiddoc/templates-sdk/components/masthead.cs
index c880eee..bb3c722 100644
--- a/tools/droiddoc/templates-sdk/components/masthead.cs
+++ b/tools/droiddoc/templates-sdk/components/masthead.cs
@@ -6,7 +6,7 @@
 <?cs if:!devsite ?><?cs # leave out the global header for devsite; it is in devsite template ?>
   <!-- Header -->
   <div id="header-wrapper">
-    <div id="header">
+    <div id="header"><?cs call:butter_bar() ?>
       <div class="wrap" id="header-wrap">
         <div class="col-3 logo">
           <a href="<?cs var:toroot ?>index.html">
@@ -261,7 +261,7 @@
 
 <!-- Header -->
 <div id="header-wrapper">
-  <div id="header">
+  <div id="header"><?cs call:butter_bar() ?>
     <div class="wrap" id="header-wrap">
       <div class="col_3 logo landing-logo" style="width:240px">
         <a href="<?cs var:toroot ?>preview/index.html">
@@ -299,3 +299,16 @@
 
   <?cs
 /def ?>
+
+
+<?cs # (UN)COMMENT THE INSIDE OF THIS METHOD TO TOGGLE VISIBILITY ?>
+<?cs def:butter_bar() ?>
+    <div style="height:20px"><!-- spacer to bump header down --></div>
+    <div id="butterbar-wrapper">
+      <div id="butterbar">
+        <a href="http://googleblog.blogspot.com/" id="butterbar-message">
+          The Android 5.0 SDK will be available on October 17th!
+        </a>
+      </div>
+    </div>
+<?cs /def ?>
\ No newline at end of file