Render low-resolution image first on Quick View.

ui/file_manager/file_manager/foreground/elements/files_quick_view.html

Index: ui/file_manager/file_manager/foreground/elements/files_quick_view.html
diff --git a/ui/file_manager/file_manager/foreground/elements/files_quick_view.html b/ui/file_manager/file_manager/foreground/elements/files_quick_view.html
index 7fa40bee710c430c33e5327f7a92f673aa86c57b..8dbfd145bf631f86aabfe172111bc4fe3c4a96d5 100644
--- a/ui/file_manager/file_manager/foreground/elements/files_quick_view.html
+++ b/ui/file_manager/file_manager/foreground/elements/files_quick_view.html
@@ -31,9 +31,11 @@
       <div id="mainPanel">
         <div id="contentPanel" metadata-box-active$="[[metadataBoxActive]]" on-tap="onContentPanelTap_">
           <div id="innerContentPanel" tabindex="0">
+            <!-- Image -->
             <template is="dom-if" if="[[isImage_(type)]]">
               <div hidden="[[!contentUrl]]">
-                <files-safe-media type="image" class="content no-close-on-click" src="[[contentUrl]]"></files-safe-media>
+                <!--files-safe-media type="image" class="content no-close-on-click" src="[[contentUrl]]"></files-safe-media-->
+                <files-safe-media type="image" class="content no-close-on-click" src="[[contentUrl]]" background="[[contentThumbnailUrl]]" image-height="[[imageHeight]]" image-width="[[imageWidth]]"></files-safe-media>
               </div>
               <template is="dom-if" if="[[!contentUrl]]">
                 <div generic-thumbnail="image"></div>
@@ -55,7 +57,7 @@
             </template>
             <!-- Audio -->
             <template is="dom-if" if="[[isAudio_(type)]]">
-              <files-safe-media type="image" id="audio-artwork" class="no-close-on-click" src="[[audioArtwork]]" hidden="[[!audioArtwork]]"></files-safe-media>
+              <files-safe-media type="image" id="audio-artwork" class="no-close-on-click" src="[[contentThumbnailUrl]]" hidden="[[!contentThumbnailUrl]]"></files-safe-media>
             </template>
             <div>
               <files-safe-media type="audio" class="no-close-on-click" autoplay="[[autoplay]]" controls src="[[audioUrl_(contentUrl, type)]]" hidden="[[!isAudio_(type)]]"></files-safe-media>