docs: Add navigation heading for Develop > Preview

Change-Id: I133672c6ecb5e778f49c31d091812ed7b6dc6b24
diff --git a/tools/droiddoc/templates-sdk/customizations.cs b/tools/droiddoc/templates-sdk/customizations.cs
index 15dc3af..7c92adb 100644
--- a/tools/droiddoc/templates-sdk/customizations.cs
+++ b/tools/droiddoc/templates-sdk/customizations.cs
@@ -1,15 +1,15 @@
-<?cs 
+<?cs
 def:fullpage() ?>
   <div id="body-content">
     <div>
 <?cs /def ?>
-<?cs 
+<?cs
 def:sdk_nav() ?>
   <div class="wrap clearfix" id="body-content"><div class="cols">
     <div class="col-4" id="side-nav" itemscope itemtype="http://schema.org/SiteNavigationElement">
       <div id="devdoc-nav" class="scroll-pane">
 
-<?cs 
+<?cs
         include:"../../../../frameworks/base/docs/html/sdk/sdk_toc.cs" ?>
 
 
@@ -26,10 +26,10 @@
   <div class="wrap clearfix" id="body-content"><div class="cols">
     <div class="col-3" id="side-nav" itemscope itemtype="http://schema.org/SiteNavigationElement">
       <div id="devdoc-nav" class="scroll-pane">
-<?cs 
+<?cs
         include:"../../../../frameworks/base/docs/html/tools/tools_toc.cs" ?>
-        
-        
+
+
       </div>
     </div> <!-- end side-nav -->
     <script>
@@ -45,9 +45,9 @@
       <div id="devdoc-nav" class="scroll-pane">
 
 
-<?cs 
+<?cs
         include:"../../../../frameworks/base/docs/html/training/training_toc.cs" ?>
-        
+
 
       </div>
     </div> <!-- end side-nav -->
@@ -72,6 +72,20 @@
     </script>
 <?cs /def ?><?cs
 
+def:preview_nav() ?>
+  <div class="wrap clearfix" id="body-content">
+    <div class="col-3" id="side-nav" itemscope itemtype="http://schema.org/SiteNavigationElement">
+      <div id="devdoc-nav" class="scroll-pane">
+<?cs include:"../../../../frameworks/base/docs/html/preview/preview_toc.cs" ?>
+      </div>
+    </div> <!-- end side-nav -->
+    <script>
+      $(document).ready(function() {
+        scrollIntoView("devdoc-nav");
+        });
+    </script>
+<?cs /def ?><?cs
+
 def:essentials_nav() ?>
   <div class="wrap clearfix" id="body-content"><div class="cols">
     <div class="col-3" id="side-nav" itemscope itemtype="http://schema.org/SiteNavigationElement">
@@ -175,9 +189,9 @@
     <div class="col-4" id="side-nav" itemscope itemtype="http://schema.org/SiteNavigationElement">
       <div id="devdoc-nav" class="scroll-pane">
 
-<?cs 
+<?cs
         include:"../../../../frameworks/base/docs/html/guide/guide_toc.cs" ?>
-        
+
 
       </div>
     </div> <!-- end side-nav -->
@@ -196,7 +210,7 @@
 
 <?cs
         include:"../../../../frameworks/base/docs/html/design/design_toc.cs" ?>
-       
+
 
       </div>
     </div> <!-- end side-nav -->
@@ -214,7 +228,7 @@
 
 <?cs
         include:"../../../../frameworks/base/docs/html/distribute/distribute_toc.cs" ?>
-        
+
 
       </div>
     </div> <!-- end side-nav -->
@@ -252,12 +266,12 @@
 
 <?cs
         include:"../../../../frameworks/base/docs/html/google/google_toc.cs" ?>
-        
+
 
       </div>
       <script type="text/javascript">
        showGoogleRefTree();
-    
+
       </script>
     </div> <!-- end side-nav -->
     <script>
@@ -275,7 +289,7 @@
 
 <?cs
         include:"../../../../frameworks/base/docs/html/about/about_toc.cs" ?>
-        
+
 
       </div>
     </div> <!-- end side-nav -->
@@ -306,23 +320,7 @@
     </script>
 <?cs /def ?>
 
-<?cs
-def:preview_nav() ?>
-  <div class="wrap clearfix" id="body-content"><div class="cols">
-    <div class="col-4" id="side-nav" itemscope itemtype="http://schema.org/SiteNavigationElement">
-      <div id="devdoc-nav" class="scroll-pane">
-        <?cs
-          include:"../../../../frameworks/base/docs/html/preview/preview_toc.cs" ?>
-      </div>
-    </div> <!-- end side-nav -->
-    <script>
-      $(document).ready(function() {
-        scrollIntoView("devdoc-nav");
-        });
-    </script>
-<?cs /def ?>
-
-<?cs # The default side navigation for the reference docs ?><?cs 
+<?cs # The default side navigation for the reference docs ?><?cs
 def:default_left_nav() ?>
 <?cs if:reference.gcm || reference.gms ?>
   <?cs call:google_nav() ?>
@@ -343,15 +341,15 @@
         <div id="api-nav-title">Android APIs</div>
         </div><!-- end nav header -->
       <script>
-        var SINCE_DATA = [ <?cs 
-          each:since = since ?>'<?cs 
-            var:since.name ?>'<?cs 
+        var SINCE_DATA = [ <?cs
+          each:since = since ?>'<?cs
+            var:since.name ?>'<?cs
             if:!last(since) ?>, <?cs /if ?><?cs
-          /each 
+          /each
         ?> ];
         buildApiLevelSelector();
       </script>
-                  
+
       <div id="swapper">
         <div id="nav-panels">
           <div id="resize-packages-nav">
@@ -366,7 +364,7 @@
           <div id="classes-nav" class="scroll-pane">
 
 
-<?cs 
+<?cs
             if:subcount(class.package) ?>
             <ul>
               <?cs call:list("Annotations", class.package.annotations) ?>
@@ -375,7 +373,7 @@
               <?cs call:list("Enums", class.package.enums) ?>
               <?cs call:list("Exceptions", class.package.exceptions) ?>
               <?cs call:list("Errors", class.package.errors) ?>
-            </ul><?cs 
+            </ul><?cs
             elif:subcount(package) ?>
             <ul>
               <?cs call:class_link_list("Annotations", package.annotations) ?>
@@ -384,11 +382,11 @@
               <?cs call:class_link_list("Enums", package.enums) ?>
               <?cs call:class_link_list("Exceptions", package.exceptions) ?>
               <?cs call:class_link_list("Errors", package.errors) ?>
-            </ul><?cs 
+            </ul><?cs
             else ?>
-              <p style="padding:10px">Select a package to view its members</p><?cs 
+              <p style="padding:10px">Select a package to view its members</p><?cs
             /if ?><br/>
-        
+
 
           </div><!-- end classes -->
         </div><!-- end nav-panels -->
@@ -429,7 +427,7 @@
         });
     </script>
 <?cs /if ?>
-    <?cs 
+    <?cs
 /def ?>
 
 
@@ -477,25 +475,27 @@
 
 
 
-<?cs 
+<?cs
 def:custom_left_nav() ?><?cs
   if:fullpage ?><?cs
     call:fullpage() ?><?cs
   elif:nonavpage ?><?cs
     call:no_nav() ?><?cs
-  elif:guide ?><?cs 
-    call:guide_nav() ?><?cs 
+  elif:guide ?><?cs
+    call:guide_nav() ?><?cs
   elif:design ?><?cs
-    call:design_nav() ?><?cs 
-  elif:training ?><?cs 
-    call:training_nav() ?><?cs 
-  elif:tools ?><?cs 
+    call:design_nav() ?><?cs
+  elif:training ?><?cs
+    call:training_nav() ?><?cs
+  elif:tools ?><?cs
     call:tools_nav() ?><?cs
-  elif:google ?><?cs 
-    call:google_nav() ?><?cs 
+  elif:google ?><?cs
+    call:google_nav() ?><?cs
   elif:samples ?><?cs
     call:samples_nav() ?><?cs
-  elif:distribute ?><?cs 
+  elif:preview ?><?cs
+    call:preview_nav() ?><?cs
+  elif:distribute ?><?cs
     if:googleplay ?><?cs
       call:googleplay_nav() ?><?cs
     elif:essentials ?><?cs
@@ -519,31 +519,29 @@
     call:distribute_nav() ?><?cs
   elif:wear ?><?cs
     call:wear_nav() ?><?cs
-  elif:preview ?><?cs
-    call:preview_nav() ?><?cs
   else ?><?cs
     call:default_left_nav() ?> <?cs
   /if ?><?cs
 /def ?>
 
-<?cs # appears at the bottom of every page ?><?cs 
+<?cs # appears at the bottom of every page ?><?cs
 def:custom_cc_copyright() ?>
-  Except as noted, this content is 
+  Except as noted, this content is
   licensed under <a href="http://creativecommons.org/licenses/by/2.5/">
-  Creative Commons Attribution 2.5</a>. For details and 
-  restrictions, see the <a href="<?cs var:toroot ?>license.html">Content 
-  License</a>.<?cs 
+  Creative Commons Attribution 2.5</a>. For details and
+  restrictions, see the <a href="<?cs var:toroot ?>license.html">Content
+  License</a>.<?cs
 /def ?>
 
-<?cs 
+<?cs
 def:custom_copyright() ?>
   Except as noted, this content is licensed under <a
-  href="http://www.apache.org/licenses/LICENSE-2.0">Apache 2.0</a>. 
+  href="http://www.apache.org/licenses/LICENSE-2.0">Apache 2.0</a>.
   For details and restrictions, see the <a href="<?cs var:toroot ?>license.html">
-  Content License</a>.<?cs 
+  Content License</a>.<?cs
 /def ?>
 
-<?cs 
+<?cs
 def:custom_footerlinks() ?>
   <a href="<?cs var:toroot ?>about/index.html">About Android</a>
   <a href="<?cs var:toroot ?>auto/index.html">Auto</a>
@@ -553,7 +551,7 @@
   <?cs
 /def ?>
 
-<?cs # appears on the right side of the blue bar at the bottom off every page ?><?cs 
+<?cs # appears on the right side of the blue bar at the bottom off every page ?><?cs
 def:custom_buildinfo() ?><?cs
   if:!google && !reference.gcm && !reference.gms ?>
     Android <?cs var:sdk.version ?>&nbsp;r<?cs var:sdk.rel.id ?> &mdash; <?cs