replace obsolete logic for meta tags with include provided by devsite,
and add data attributes to the ReferenceObject itemprop tag that carry
api level information for the future version of the API level selector.
Note that if the build specifies 'library.root' then that is still used
to specify the _book.yaml location in a django variable. This way,
we still have control from the DevSite include as to whether we use it.

TODO: Add these data attributes to the rest of the template for
method/member docs. (I don't want this CL to be too messy.)
bug: 67899891
bug: 69369545

Test on both support library and framework doc builds.
Example from framework build:
<head>
  <title>ProgressDialog</title>
  {% include "_shared/_reference-head-tags.html" %}
  <meta name="body_class" value="api apilevel-1" />
</head>
<body ...>
<div itemscope itemtype="http://developers.google.com/ReferenceObject"
     data-version-added="1" data-version-deprecated="26" >
<!-- This DIV closes at the end of the BODY -->
  <meta itemprop="name" content="android.app.ProgressDialog" />
  <meta itemprop="path" content="Deprecated" />

Example from support lib build:
<head>
  <title>DynamicAnimation</title>
  {% setvar book_path %}/reference/android/support/_book.yaml{% endsetvar %}
  {% include "_shared/_reference-head-tags.html" %}
  <meta name="body_class" value="api apilevel-26.1.0" />
</head>
<body ...>
<div itemscope itemtype="http://developers.google.com/ReferenceObject"
     data-version-added="26.1.0" >
<!-- This DIV closes at the end of the BODY -->
  <meta itemprop="name" content="android.support.animation.DynamicAnimation" />
  <meta itemprop="path" content="Support Library" />

Change-Id: Ibda945b90fe74f594637d93b987a596ff5cf36bd
diff --git a/res/assets/templates-sdk/class.cs b/res/assets/templates-sdk/class.cs
index 3891504..ff80dd9 100644
--- a/res/assets/templates-sdk/class.cs
+++ b/res/assets/templates-sdk/class.cs
@@ -209,13 +209,21 @@
 <html<?cs if:devsite ?> devsite<?cs /if ?>>
 <?cs include:"head_tag.cs" ?>
 <?cs include:"body_tag.cs" ?>
-<div itemscope itemtype="http://developers.google.com/ReferenceObject">
+<div itemscope itemtype="http://developers.google.com/ReferenceObject"
+     data-version-added="<?cs var:class.since ?>"<?cs
+     if:class.deprecatedsince
+       ?> data-version-deprecated="<?cs var:class.deprecatedsince ?>"<?cs
+     /if ?> >
 <!-- This DIV closes at the end of the BODY -->
   <meta itemprop="name" content="<?cs var:class.qualifiedType.label ?>" />
   <?cs if:(dac&&class.artifact)
-    ?><meta itemprop="path" content="Support Library" /><?cs
+    ?><meta itemprop="path" content="<?cs
+          if:class.deprecatedsince ?>Deprecated<?cs
+          else ?>Support Library<?cs /if ?>" /><?cs
   elif:(dac&&class.since)
-    ?><meta itemprop="path" content="API level <?cs var:class.since ?>" /><?cs
+    ?><meta itemprop="path" content="<?cs
+          if:class.deprecatedsince ?>Deprecated<?cs
+          else ?>API level <?cs var:class.since ?><?cs /if ?>" /><?cs
   /if ?>
 <?cs include:"header.cs" ?>
 <?cs # Includes api-info-block DIV at top of page. Standard Devsite uses right nav. ?>
diff --git a/res/assets/templates-sdk/head_tag.cs b/res/assets/templates-sdk/head_tag.cs
index bcc4fed..f1a6e37 100644
--- a/res/assets/templates-sdk/head_tag.cs
+++ b/res/assets/templates-sdk/head_tag.cs
@@ -13,171 +13,14 @@
 # END if/else devsite ?></title><?cs
   ####### If building devsite, add some meta data needed for when generating the top nav ######### ?><?cs
 if:devsite ?>
-  <meta name="top_category" value="<?cs
-      if:ndk ?>ndk<?cs
-      elif:(guide||develop||training||reference||tools||sdk||google||reference.gms||reference.gcm||samples) ?>develop<?cs
-      elif:(topic||libraries||instantapps||perf||arc) ?>develop<?cs
-      elif:(distribute||googleplay||essentials||users||engage||monetize||disttools||stories||analyze) ?>distribute<?cs
-      elif:(design||vision||material||patterns||devices||designdownloads) ?>design<?cs
-      elif:(about||versions||wear||tv||auto) ?>about<?cs
-      elif:wearpreview ?>about<?cs
-      elif:work ?>about<?cs
-      elif:preview ?>preview<?cs
-      else ?>none<?cs
-      /if ?>" /><?cs set:dac_subcategory_set = #1 ?>
-  <meta name="subcategory" value="<?cs
-      if:ndk ?><?cs
-        if:guide ?>guide<?cs
-        elif:samples ?>samples<?cs
-          if:(samplesDocPage&&!samplesProjectIndex) ?> samples-docpage<?cs /if ?><?cs
-        elif:reference ?>reference<?cs
-        elif:downloads ?>downloads<?cs
-        else ?>none<?cs set:dac_subcategory_set = #0 ?><?cs /if ?><?cs
-      else ?><?cs
-        if:(guide||develop||training||reference||tools||sdk||samples) ?><?cs
-          if:guide ?>guide<?cs
-          elif:training ?><?cs
-            if:page.trainingcourse ?>trainingcourse<?cs
-            else ?>training<?cs /if ?><?cs
-          elif:reference ?>reference<?cs
-          elif:samples ?>samples<?cs
-            if:(samplesDocPage&&!samplesProjectIndex) ?> samples-docpage<?cs /if ?><?cs
-          else ?>none<?cs set:dac_subcategory_set = #0 ?><?cs /if ?><?cs
-        elif:(google||reference.gms||reference.gcm) ?>google<?cs
-        elif:(topic||libraries||perf||arc) ?><?cs
-          if:libraries ?>libraries<?cs
-          elif:instantapps ?>instantapps<?cs
-          elif:perf ?>perf<?cs
-          elif:arc ?>arc<?cs
-          else ?>none<?cs set:dac_subcategory_set = #0 ?><?cs /if ?><?cs
-        elif:(distribute||googleplay||essentials||users||engage||monetize||disttools||stories||analyze) ?><?cs
-          if:googleplay ?>googleplay<?cs
-          elif:essentials ?>essentials<?cs
-          elif:users ?>users<?cs
-          elif:engage ?>engage<?cs
-          elif:monetize ?>monetize<?cs
-          elif:disttools ?>disttools<?cs
-          elif:stories ?>stories<?cs
-          elif:analyze ?>analyze<?cs
-          else ?>none<?cs set:dac_subcategory_set = #0 ?><?cs /if ?><?cs
-        elif:(about||versions||wear||tv||auto) ?>about<?cs
-        elif:preview ?>preview<?cs
-        elif:wearpreview ?>wear<?cs
-        elif:work ?>work<?cs
-        elif:design ?>design<?cs
-        elif:walkthru ?>walkthru<?cs
-        else ?>none<?cs set:dac_subcategory_set = #0 ?><?cs /if ?><?cs
-      /if ?>" /><?cs
-      if:nonavpage ?>
-  <meta name="hide_toc" value='True' /><?cs
-      elif: !nonavpage && dac_subcategory_set && !tools && !sdk ?>
-  <meta name="book_path" value="<?cs
-        if:!dac ?><?cs
-          if:book.path ?><?cs var:book.path ?><?cs
-          else ?>/_book.yaml<?cs
-          /if ?>" /><?cs
-        else ?><?cs
-          if:ndk ?>/ndk<?cs
-            if:guide ?>/guides<?cs
-            elif:samples ?>/samples<?cs
-            elif:reference ?>/reference<?cs
-            elif:downloads ?>/downloads<?cs /if ?><?cs
-          elif:library.root ?>/reference/<?cs var:library.root ?><?cs
-          else ?><?cs
-            if:(guide||develop||training||reference||tools||sdk||samples) ?><?cs
-              if:guide ?>/guide<?cs
-              elif:training ?>/training<?cs
-              elif:reference ?>/reference<?cs
-              elif:samples ?>/samples<?cs /if ?><?cs
-            elif:(google||reference.gms||reference.gcm) ?>/google<?cs
-            elif:(topic||libraries||perf) ?>/topic<?cs
-              if:libraries ?>/libraries<?cs
-              elif:instantapps ?>/instant-apps<?cs
-              elif:perf ?>/performance<?cs
-              elif:arc ?>/arc<?cs /if ?><?cs
-            elif:(distribute||googleplay||essentials||users||engage||monetize||disttools||stories||analyze) ?>/distribute<?cs
-              if:googleplay ?>/googleplay<?cs
-              elif:essentials ?>/essentials<?cs
-              elif:users ?>/users<?cs
-              elif:engage ?>/engage<?cs
-              elif:monetize ?>/monetize<?cs
-              elif:disttools ?>/tools<?cs
-              elif:stories ?>/stories<?cs
-              elif:analyze ?>/analyze<?cs /if ?><?cs
-            elif:(about||versions||wear||tv||auto) ?>/about<?cs
-            elif:preview ?>/preview<?cs
-            elif:wearpreview ?>/wear/preview<?cs
-            elif:work ?>/work<?cs
-            elif:design ?>/design<?cs
-            elif:walkthru ?>/walkthru<?cs /if ?><?cs
-          /if ?>/_book.yaml" /><?cs
-        /if ?><?cs
-      /if ?>
-  <meta name="project_path" value="<?cs
-      if:!dac ?><?cs
-        if:project.path ?><?cs var:project.path ?><?cs
-        else ?>/_project.yaml<?cs
-        /if ?>" /><?cs
-      else ?><?cs
-        if:(guide||develop||training||reference||tools||sdk||samples) ?><?cs
-          if:guide ?>/guide<?cs
-          elif:training ?>/training<?cs
-          elif:reference ?>/reference<?cs
-          elif:samples ?>/samples<?cs /if ?><?cs
-        elif:(google||reference.gms||reference.gcm) ?>/google<?cs
-        elif:(topic||libraries) ?>/develop<?cs
-        elif:(distribute||googleplay||essentials||users||engage||monetize||disttools||stories||analyze) ?>/distribute<?cs
-          if:googleplay ?>/googleplay<?cs
-          elif:essentials ?>/essentials<?cs
-          elif:users ?>/users<?cs
-          elif:engage ?>/engage<?cs
-          elif:monetize ?>/monetize<?cs
-          elif:disttools ?>/tools<?cs
-          elif:stories ?>/stories<?cs
-          elif:analyze ?>/analyze<?cs
-          else ?><?cs /if ?><?cs
-        elif:(about||versions||wear||tv||auto) ?><?cs
-          if:versions ?>/about/versions<?cs
-          elif:wear ?>/wear<?cs
-          elif:tv ?>/tv<?cs
-          elif:auto ?>/auto<?cs
-          else ?>/about<?cs /if ?><?cs
-        elif:wearpreview ?>/wear/preview<?cs
-        elif:work ?>/work<?cs
-        elif:preview ?>/preview<?cs
-        elif:design ?>/design<?cs /if ?>/_project.yaml" /><?cs
-      /if ?><?cs
-      if:page.tags && page.tags != "" ?>
-  <meta name="keywords" value='<?cs var:page.tags ?>' /><?cs
-      /if ?><?cs
-      if:meta.tags && meta.tags != "" ?>
-  <meta name="meta_tags" value='<?cs var:meta.tags ?>' /><?cs
-      /if ?><?cs
-      if:fullpage ?>
-  <meta name="full_width" value="True" /><?cs
-      /if ?><?cs
-      if:page.landing ?>
-  <meta name="page_type" value="landing" /><?cs
-      /if ?><?cs
-      if:page.article ?>
-  <meta name="page_type" value="article" /><?cs
-      /if ?><?cs
-      if:page.image ?>
-  <meta name="image_path" value='<?cs var:page.image ?>' /><?cs
-      /if ?><?cs
-      if:excludeFromSuggestions ?>
-  <meta name="hide_from_search_suggest" value="true" /><?cs
-      /if ?><?cs
-      if:reference ?>
-  <meta name="body_class" value="api apilevel-<?cs var:class.since ?><?cs var:package.since ?>" />
-  <meta name="page_type" value="reference" /><?cs
-      /if ?><?cs
-      if:!dac ?>
-  <meta name="hide_page_heading" value="true" /><?cs
-      /if ?><?cs
-/if ?><?cs # END if/else devsite ?><?cs
-
-  if:!devsite ?>
+  <?cs # if this build set `library.root` then set a django variable to be used by the subsequent
+       # _reference-head-tags.html file for the book path (or ignored if its no longer needed) ?>
+  <?cs if:library.root
+    ?>{% setvar book_path %}/reference/<?cs var:library.root ?>/_book.yaml{% endsetvar %}<?cs
+  /if ?>
+  {% include "_shared/_reference-head-tags.html" %}
+  <meta name="body_class" value="api apilevel-<?cs var:class.since ?><?cs var:package.since ?>" /><?cs
+else ?>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" />
 <meta content="IE=edge" http-equiv="X-UA-Compatible">
diff --git a/res/assets/templates-sdk/package.cs b/res/assets/templates-sdk/package.cs
index 2d9e628..8e5e18c 100644
--- a/res/assets/templates-sdk/package.cs
+++ b/res/assets/templates-sdk/package.cs
@@ -6,7 +6,11 @@
 <html<?cs if:devsite ?> devsite<?cs /if ?>>
 <?cs include:"head_tag.cs" ?>
 <?cs include:"body_tag.cs" ?>
-<div itemscope itemtype="http://developers.google.com/ReferenceObject">
+<div itemscope itemtype="http://developers.google.com/ReferenceObject"
+     data-version-added="<?cs var:package.since ?>"<?cs
+     if:package.deprecatedsince
+       ?> data-version-deprecated="<?cs var:package.deprecatedsince ?>"<?cs
+     /if ?> >
 <!-- This DIV closes at the end of the BODY -->
   <meta itemprop="name" content="<?cs var:page.title ?>" />
   <?cs if:(dac&&package.since)
diff --git a/res/assets/templates-sdk/page_info.cs b/res/assets/templates-sdk/page_info.cs
index 4bdda67..3b7fbc4 100644
--- a/res/assets/templates-sdk/page_info.cs
+++ b/res/assets/templates-sdk/page_info.cs
@@ -27,10 +27,12 @@
   <?cs if:class.artifact ?>
     <br><?cs call:artifact_tags(class) ?>
   <?cs /if ?>
-  <?cs if:class.deprecatedsince ?>
-    <br>Deprecated since
+  <?cs if:class.deprecatedsince ?><?cs
+    if:class.artifact ?><br>Deprecated since version <?cs var:class.deprecatedsince ?><?cs
+    else ?><br>Deprecated since
     <a href="<?cs var:toroot ?>guide/topics/manifest/uses-sdk-element.html#ApiLevels">API level
-      <?cs var:class.deprecatedsince ?></a>
+      <?cs var:class.deprecatedsince ?></a><?cs
+    /if ?>
   <?cs /if ?>
   <?cs call:federated_refs(class) ?>
 </div>