Quick View: Support pdf and text preview.

ui/file_manager/file_manager/foreground/js/quick_view_controller.js

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Controller for QuickView.
  *
  * @param {!FilesQuickView} quickView
  * @param {!MetadataModel} metadataModel File system metadata.
  * @param {!FileSelectionHandler} selectionHandler
@@ skipping 185 matching lines @@
 
 /**
  * Update quick view using file entry and loaded metadata.
  *
  * @param {!FileEntry} entry
  * @param {Array<MetadataItem>} items
  * @private
  */
 QuickViewController.prototype.onMetadataLoaded_ = function(entry, items) {
   return this.getQuickViewParameters_(entry, items).then(function(params) {
-    this.quickView_.contentUrl = params.contentUrl || '';
     this.quickView_.type = params.type || '';
     this.quickView_.filePath = params.filePath || '';
+    this.quickView_.contentUrl = params.contentUrl || '';
     this.quickView_.videoPoster = params.videoPoster || '';
     this.quickView_.audioArtwork = params.audioArtwork || '';
     this.quickView_.autoplay = params.autoplay || false;
+    this.quickView_.browsable = params.browsable || false;
   }.bind(this));
 };
 
 /**
  * @typedef {{
  *   type: string,
  *   filePath: string,
  *   contentUrl: (string|undefined),
  *   videoPoster: (string|undefined),
  *   audioArtwork: (string|undefined),
- *   autoplay: (boolean|undefined)
+ *   autoplay: (boolean|undefined),
+ *   browsable: (boolean|undefined),
  * }}
  */
 var QuickViewParams;
 
 /**
  * @param {!FileEntry} entry
  * @param {Array<MetadataItem>} items
  * @return !Promise<!QuickViewParams>
  *
  * @private
@@ skipping 71 matching lines @@
             var file = values[1];
             var item = items[0];
             if (item.contentThumbnailUrl) {
               params.audioArtwork = item.contentThumbnailUrl;
             }
             params.contentUrl = URL.createObjectURL(file);
             return params;
           });
     }
   }
-  return Promise.resolve(params);
+  if (item.externalFileUrl || type === '.folder') {
+    return Promise.resolve(params);
+  }
+  return Promise
+      .all([
+        getFile(entry),
+        new Promise(function(resolve) {
+          chrome.fileManagerPrivate.getFileTasks([entry], resolve);
+        })
+      ])
+      .then(function(values) {
+        var file = values[0];
+        var tasks = values[1];
+        var browsable = tasks.some(function(task) {
+          return ['view-in-browser', 'view-pdf'].includes(
+              task.taskId.split('|')[2]);
+        });
+        params.browsable = browsable;
+        params.contentUrl = browsable && URL.createObjectURL(file);
+        return params;
+      });
 };
 
 /**
  * Loads a thumbnail from Drive.
  *
  * @param {string} url Thumbnail url
  * @return Promise<{{status: string, data:string, width:number, height:number}}>
  * @private
  */
 QuickViewController.prototype.loadThumbnailFromDrive_ = function(url) {
   return new Promise(function(resolve) {
     ImageLoaderClient.getInstance().load(url, resolve)
   });
 };