Add material design toggle ripple element.

ui/file_manager/externs/files_elements.js

Index: ui/file_manager/externs/files_elements.js
diff --git a/chrome/android/javatests/src_dummy/org/chromium/chrome/browser/test/dummy/Dummy.java b/ui/file_manager/externs/files_elements.js
similarity index 53%
copy from chrome/android/javatests/src_dummy/org/chromium/chrome/browser/test/dummy/Dummy.java
copy to ui/file_manager/externs/files_elements.js
index 1805ad6244642cde6711c06bf15cfd17b0a3a0ed..16a79d2029d2c7ae61d2491cc75a9a8104f69a61 100644
--- a/chrome/android/javatests/src_dummy/org/chromium/chrome/browser/test/dummy/Dummy.java
+++ b/ui/file_manager/externs/files_elements.js
@@ -2,10 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package org.chromium.chrome.browser.test.dummy;
+/**
+ * @constructor
+ * @struct
+ * @extends {HTMLElement}
+ */
+function FilesToggleRipple() {}
 
 /**
- * Does nothing.
- * TODO(newt): Delete after the switch to GN. This is only used in GYP.
+ * @type {boolean}
  */
-class Dummy {}
+FilesToggleRipple.prototype.activated;