Gallery: Add browser tests to apply the exposure effect for an image.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

 // Copyright (c) 2013 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.
 
 // Browser test for basic Chrome OS file manager functionality:
 //  - The file list is updated when a file is added externally to the Downloads
 //    folder.
 //  - Selecting a file and copy-pasting it with the keyboard copies the file.
 //  - Selecting a file and pressing delete deletes it.
 
@@ skipping 1432 matching lines @@
   set_test_case_name("cropImageOnDownloads");
   StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, CropImageOnDrive) {
   AddScript("gallery/photo_editor.js");
   set_test_case_name("cropImageOnDrive");
   StartTest();
 }
 
+IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, ExposureImageOnDownloads) {
+  AddScript("gallery/photo_editor.js");
+  set_test_case_name("exposureImageOnDownloads");
+  StartTest();
+}
+
+IN_PROC_BROWSER_TEST_F(GalleryBrowserTestInGuestMode,
+                       ExposureImageOnDownloads) {
+  AddScript("gallery/photo_editor.js");
+  set_test_case_name("exposureImageOnDownloads");
+  StartTest();
+}
+
+IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, ExposureImageOnDrive) {
+  AddScript("gallery/photo_editor.js");
+  set_test_case_name("exposureImageOnDrive");
+  StartTest();
+}
+
 }  // namespace
 }  // namespace file_manager