port fix preview pdf in pdfjs

lib/classes/media/subdef.php

@@ -89,6 +89,7 @@ class media_subdef extends media_abstract implements cache_cacheableInterface
     const TYPE_AUDIO_MP3 = 'AUDIO_MP3';
     const TYPE_IMAGE = 'IMAGE';
     const TYPE_NO_PLAYER = 'UNKNOWN';
+    const TYPE_PDF = 'PDF';
 
     /*
      * Technical datas types constants
@@ -407,6 +408,7 @@ class media_subdef extends media_abstract implements cache_cacheableInterface
     {
         static $types = [
             'application/x-shockwave-flash' => self::TYPE_FLEXPAPER,
+            'application/pdf' => self::TYPE_PDF,
             'audio/mp3' => self::TYPE_AUDIO_MP3,
             'audio/mpeg' => self::TYPE_AUDIO_MP3,
             'image/gif' => self::TYPE_IMAGE,

templates/web/common/thumbnail.html.twig

@@ -19,7 +19,7 @@
                     src="{{ url('alchemy_embed_view', {url: url|trim, autoplay: autoplay|default('false') }) }}"
                     frameborder="0" allowfullscreen></iframe>
         </div>
-    {% elseif record_type == 'FLEXPAPER' %}
+    {% elseif record_type == 'FLEXPAPER' or record_type == 'PDF' %}
         <div id="phraseanet-embed-frame" class="documentTips"
              data-original-width="{{original_w}}"
              data-original-height="{{original_h}}"