Fixed css for selected buttons in Files.app's photo editor.

chrome/browser/resources/file_manager/css/gallery.css

 /* 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. */
 
 body {
   -webkit-user-select: none;
   font-family: Open Sans, Droid Sans Fallback, sans-serif;
   font-size: 84%;
   margin: 0;
 }
@@ skipping 558 matching lines @@
   background-color: rgba(240, 240, 240, 1);
   color: black;
 }
 
 .gallery > .toolbar button.autofix {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_autofix.png') 1x,
     url('../images/gallery/2x/icon_autofix.png') 2x);
 }
 
+.gallery > .toolbar button.autofix:active,
 .gallery > .toolbar button.autofix[pressed] {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_autofix_selected.png') 1x,
     url('../images/gallery/2x/icon_autofix_selected.png') 2x);
 }
 
 .gallery > .toolbar button.crop {
   background-image:  -webkit-image-set(
     url('../images/gallery/icon_crop.png') 1x,
     url('../images/gallery/2x/icon_crop.png') 2x);
 }
 
+.gallery > .toolbar button.crop:active,
 .gallery > .toolbar button.crop[pressed] {
   background-image:  -webkit-image-set(
     url('../images/gallery/icon_crop_selected.png') 1x,
     url('../images/gallery/2x/icon_crop_selected.png') 2x);
 }
 
 .gallery > .toolbar button.exposure {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_brightness.png') 1x,
     url('../images/gallery/2x/icon_brightness.png') 2x);
 }
 
+.gallery > .toolbar button.exposure:active,
 .gallery > .toolbar button.exposure[pressed] {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_brightness_selected.png') 1x,
     url('../images/gallery/2x/icon_brightness_selected.png') 2x);
 }
 
 .gallery > .toolbar button.rotate_right {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_rotate.png') 1x,
     url('../images/gallery/2x/icon_rotate.png') 2x);
 }
 
+.gallery > .toolbar button.rotate_right:active,
 .gallery > .toolbar button.rotate_right[pressed] {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_rotate_selected.png') 1x,
     url('../images/gallery/2x/icon_rotate_selected.png') 2x);
 }
 
 .gallery > .toolbar button.rotate_left {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_rotate_left.png') 1x,
     url('../images/gallery/2x/icon_rotate_left.png') 2x);
 }
 
+.gallery > .toolbar button.rotate_left:active,
 .gallery > .toolbar button.rotate_left[pressed] {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_rotate_left_selected.png') 1x,
     url('../images/gallery/2x/icon_rotate_left_selected.png') 2x);
 }
 
 .gallery > .toolbar button.undo {
   background-image: -webkit-image-set(
     url('../images/gallery/icon_undo.png') 1x,
     url('../images/gallery/2x/icon_undo.png') 2x);
@@ skipping 626 matching lines @@
     url('../images/gallery/slideshow-pause.png') 1x,
     url('../images/gallery/2x/slideshow-pause.png') 2x);
 }
 
 .slideshow-toolbar > .slideshow-end {
   background-image: -webkit-image-set(
     url('../images/gallery/slideshow-end.png') 1x,
     url('../images/gallery/2x/slideshow-end.png') 2x);
   margin-left: -2px;
 }