fix position of bubble in gallery to consider RTL

ui/file_manager/gallery/css/gallery.css

 /* Copyright (c) 2014 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;
   background-color: black;
   font-size: 84%;
   margin: 0;
 }
@@ skipping 22 matching lines @@
     url(../../file_manager/foreground/images/common/2x/bubble_point_white.png) 2x);
   display: block;
   height: 11px;
   left: 24px;
   margin: 0 0 0 -5px;
   outline: none;
   position: absolute;
   width: 17px;
 }
 
+html[dir='rtl'] .bubble .pointer {
+  margin: 0 -5px 0 0;
+  left: auto;
+  right: 24px;
+}
+
 .bubble .pointer:not(.bottom) {
   top: -11px;
 }
 
 .bubble .pointer.bottom {
   transform: rotate(180deg);
   bottom: -11px;
 }
 
 .bubble .close-x {
   background: -webkit-image-set(
     url(../../file_manager/foreground/images/common/close_x_gray.png) 1x,
     url(../../file_manager/foreground/images/common/2x/close_x_gray.png) 2x);
   height: 21px;
   opacity: 0.3;
   position: absolute;
   right: 3px;
   top: 3px;
   width: 21px;
 }
 
+html[dir='rtl'] .bubble .close-x {
+  right: auto;
+  left: 3px;
+}
+
 .bubble .close-x:hover {
   opacity: 0.7;
 }
 
 paper-ripple,
 paper-button::shadow paper-ripple {
   color: black;
 }
 
 files-toggle-ripple::shadow .ripple.activated {
@@ skipping 279 matching lines @@
 /* Bubble */
 
 .gallery .toolbar .bubble {
   bottom: 65px;
   font-size: 85%;
   left: 20px;
   position: absolute;
   width: 220px;
 }
 
+html[dir='rtl'] .gallery .toolbar .bubble {
+  left: auto;
+  right: 20px;
+}
+
 .gallery:not([editing]) .toolbar .bubble {
   display: none;
 }
 
 /* Middle spacer */
 
 .gallery .middle-spacer {
   align-items: center;
   display: flex;
   flex: 1 0 auto;
@@ skipping 991 matching lines @@
 .thumbnail-view .animation-thumbnail {
   background-repeat: no-repeat;
   background-size: cover;
   display: none;
   position: absolute;
 }
 
 .thumbnail-view .animation-thumbnail.animating {
   display: block;
 }