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

chrome/test/data/extensions/api_test/filebrowser_component/main.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.
 
 /*
 This component extension test does the following:
 
-1. Creates a txt and log file on the local file system with some random text.
-2. Finds a registered task (file item context menu) for txt file and invokes it
+1. Creates an abc and log file on the local file system with some random text.
+2. Finds a registered task (file item context menu) for abc file and invokes it
    with url of the test file.
 3. Listens for a message from context menu handler and makes sure its payload
    matches the random text from the test file.
 */
 
 var cleanupError = 'Got unexpected error while cleaning up test directory.';
 
 // Class specified by the client runnig the TestRunner.
-// |expectedTasks| should contain list of actions defined for txt files defined
+// |expectedTasks| should contain list of actions defined for abc files defined
 //     by filesystem_handler part of the test.
 // |fileVerifierFunction| method that will verify test results received from the
 //     filesystem_handler part of the test.
 //     The method will be passed received fileEntry object, original file
 //     content, file content received from filesystem_handler and callback
 //     function that will expect error object as its argument (or undefined on
 //     success).
 var TestExpectations = function(expectedTasks, fileVerifierFunction) {
   this.fileText_ = undefined;
   this.file_ = undefined;
@@ skipping 85 matching lines @@
   }
 
   this.fileCreator_.init(fs, this.onFileCreatorInit_.bind(this),
                              this.errorCallback_.bind(this));
 };
 
 TestRunner.prototype.onFileCreatorInit_ = function() {
   var self = this;
   this.fileCreator_.createFile('.log',
       function(file, text) {
-        self.fileCreator_.createFile('.tXt',
+        self.fileCreator_.createFile('.aBc',
             self.onFileCreated_.bind(self),
             self.errorCallback_.bind(self));
       },
       this.errorCallback_.bind(this));
 };
 
 TestRunner.prototype.onFileCreated_ = function(file, text) {
   // Start
   console.log('Get registered tasks now...');
   this.expectations_.setFileAndFileText(file, text);
@@ skipping 76 matching lines @@
   if (!error) {
     sendResponse({success: true});
     this.fileCreator_.cleanupAndEndTest(this.reportSuccess_.bind(this),
                                         this.reportFail_.bind(this,
                                                               cleanupError));
   } else {
     sendResponse({success: false});
     this.errorCallback_(error);
   }
 };