[filebrowser] Introduce View action for supported file types (e.g. pdf).

chrome/browser/resources/file_manager/js/file_manager.js

 // Copyright (c) 2012 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.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 const EMPTY_IMAGE_URI = 'data:image/gif;base64,'
         + 'R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw%3D%3D';
 
 /**
@@ skipping 2155 matching lines @@
 
   /**
    * Callback called when tasks for selected files are determined.
    * @param {Object} selection Selection is passed here, since this.selection
    *     can change before tasks were found, and we should be accurate.
    * @param {Array.<Task>} tasksList The tasks list.
    */
   FileManager.prototype.onTasksFound_ = function(selection, tasksList) {
     this.taskItems_.clear();
 
+    var tasksCount = 0;
     for (var i = 0; i < tasksList.length; i++) {
       var task = tasksList[i];
 
       // Tweak images, titles of internal tasks.
       var task_parts = task.taskId.split('|');
       if (task_parts[0] == this.getExtensionId_()) {
         task.internal = true;
         if (task_parts[1] == 'play') {
           // TODO(serya): This hack needed until task.iconUrl is working
           //             (see GetFileTasksFileBrowserFunction::RunImpl).
           task.iconUrl =
               chrome.extension.getURL('images/icon_play_16x16.png');
           task.title = str('PLAY_MEDIA').replace("&", "");
           this.playTask_ = task;
         } else if (task_parts[1] == 'mount-archive') {
           task.iconUrl =
               chrome.extension.getURL('images/icon_mount_archive_16x16.png');
           task.title = str('MOUNT_ARCHIVE');
         } else if (task_parts[1] == 'gallery') {
           task.iconUrl =
               chrome.extension.getURL('images/icon_preview_16x16.png');
-          task.title = str('GALLERY');
+          task.title = str('OPEN_ACTION');
           task.allTasks = tasksList;
-          this.galleryTask_ = task;
+        } else if (task_parts[1] == 'view-pdf') {
+          // Do not render this task if disabled.
+          if (str('PDF_VIEW_ENABLED') == 'false') continue;
+          task.iconUrl =
+              chrome.extension.getURL('images/icon_preview_16x16.png');
+          task.title = str('OPEN_ACTION');
+        } else if (task_parts[1] == 'view-txt') {
+          task.iconUrl =
+              chrome.extension.getURL('images/icon_preview_16x16.png');
+          task.title = str('OPEN_ACTION');
+        } else if (task_parts[1] == 'install-crx') {
+          // TODO(dgozman): change to the right icon.
+          task.iconUrl =
+              chrome.extension.getURL('images/icon_preview_16x16.png');
+          task.title = str('INSTALL_CRX');
         }
       }
       this.renderTaskItem_(task);
+      tasksCount++;
     }
 
-    this.taskItems_.visible = tasksList.length > 0;
+    this.taskItems_.visible = tasksCount > 0;
 
     selection.tasksList = tasksList;
     if (selection.dispatchDefault) {
       // We got a request to dispatch the default task for the selection.
       selection.dispatchDefault = false;
       this.dispatchDefaultTask_(selection);
     }
     // These are done in separate functions, as the checks require
     // asynchronous function calls.
     this.maybeRenderFormattingTask_(selection);
@@ skipping 235 matching lines @@
       var noGallery = [];
       for (var index = 0; index < details.task.allTasks.length; index++) {
         var task = details.task.allTasks[index];
         if (task.taskId != this.getExtensionId_() + '|gallery') {
           // Add callback, so gallery can execute the task.
           task.execute = this.dispatchFileTask_.bind(this, task);
           noGallery.push(task);
         }
       }
       this.openGallery_(urls, noGallery);
+    } else if (id == 'view-pdf' || id == 'view-txt' || id == 'install-crx') {
+      chrome.fileBrowserPrivate.viewFiles(urls, 'default', function() {});
     }
   };
 
   FileManager.prototype.getDeviceNumber = function(entry) {
     if (!entry.isDirectory) return undefined;
     for (var i = 0; i < this.mountPoints_.length; i++) {
       if (normalizeAbsolutePath(entry.fullPath) ==
           normalizeAbsolutePath(this.mountPoints_[i].mountPath)) {
         return i;
       }
@@ skipping 1464 matching lines @@
           });
       }, onError);
 
       function onError(err) {
         console.log('Error while checking free space: ' + err);
         setTimeout(doCheck, 1000 * 60);
       }
     }
   }
 })();