Material PDF: Support RTL languages

chrome/browser/resources/pdf/elements/viewer-zoom-toolbar/viewer-zoom-button.css

Index: chrome/browser/resources/pdf/elements/viewer-zoom-toolbar/viewer-zoom-button.css
diff --git a/chrome/browser/resources/pdf/elements/viewer-zoom-toolbar/viewer-zoom-button.css b/chrome/browser/resources/pdf/elements/viewer-zoom-toolbar/viewer-zoom-button.css
index 82e44ca6f1e89f6292a1ecc8cba9c6d87e0e73af..c9bb1896f964af0b94381c0205fccb1522b2af1d 100644
--- a/chrome/browser/resources/pdf/elements/viewer-zoom-toolbar/viewer-zoom-button.css
+++ b/chrome/browser/resources/pdf/elements/viewer-zoom-toolbar/viewer-zoom-button.css
@@ -2,6 +2,20 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
+#wrapper {
+  transition: transform 250ms;
+  transition-timing-function: cubic-bezier(0, 0, 0.2, 1);
+}
+
+:host([closed]) #wrapper {
+  transform: translateX(100%);
+  transition-timing-function: cubic-bezier(0.4, 0, 1, 1);
+}
+
+:host-context([dir=rtl]):host([closed]) #wrapper {
+  transform: translateX(-100%);
+}
+
 paper-fab {
   --paper-fab-keyboard-focus-background: var(--viewer-icon-ink-color);
   --paper-fab-mini: {