Add material design toggle ripple element.

ui/file_manager/file_manager/foreground/elements/files_toggle_ripple.js

+// Copyright 2015 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.
+
+/**
+ * Toggle Ripple.
+ *
+ * You can change ripple color by the following CSS selector.
+ *
+ * files-toggle-ripple#my-button::shadow .ripple {
+ *   background-color: black;
+ * }
+ *
+ * Ripple size of the activated state is same with the size of this element.
+ */
+var FilesToggleRipple = Polymer({
+  is: 'files-toggle-ripple',
+
+  properties: {
+    'activated': {
+      type: Boolean,
+      value: false,
+      observer: 'activatedChanged_'
+    },
+  },
+
+  /**
+   * Called when value of activated property is changed.
+   * @param {boolean} newValue New value.
+   * @param {boolean} oldValue Old value.
+   * @private
+   */
+  activatedChanged_: function(newValue, oldValue) {
+    if (newValue === oldValue)
+      return;
+
+    if (newValue)
+      this.performActivateAnimation_();
+    else
+      this.performDeactivateAnimation_();
+  },
+
+  /**
+   * Perform activate animation.
+   * @private
+   */
+  performActivateAnimation_: function() {
+    this.$.ripple.animate([
+        {opacity: 0, offset: 0, easing: 'linear'},
+        {opacity: 0.2, offset: 1}
+    ], 50);
+    this.$.ripple.animate([
+        {

[fukino, 2015/06/16 07:34:16]

nit: Indent level should be 2 after [.

[yawano, 2015/06/16 07:38:57]

Done.

+          width: '31.9%',
+          height: '31.9%',
+          offset: 0,
+          easing: 'cubic-bezier(0, 0, 0.330066603741, 0.931189591041)'
+        },
+        {
+          width: '80.9%',
+          height: '80.9%',
+          offset: 0.5,
+          easing: 'cubic-bezier(0.435623148352, 0.141946042876, 0.2, 1.0)'
+        },
+        {
+          width: '50%',
+          height: '50%',
+          offset: 1
+        }
+    ], 500);
+    this.$.ripple.animate([
+        {
+          'border-radius': '50%',
+          offset: 0,
+          easing: 'linear'
+        },
+        {
+          'border-radius': '50%',
+          offset: 0.333,
+          easing: 'cubic-bezier(0.109613342381, 0.32112094549, 0.2, 1.0)'
+        },
+        {
+          'border-radius': '2px',
+          offset: 1
+        }
+    ], 750);
+
+    this.$.ripple.classList.add('activated');
+  },
+
+  /**
+   * Perform deactivate animation.
+   * @private
+   */
+  performDeactivateAnimation_: function() {
+    this.$.ripple.animate([
+      {opacity: 0.2, offset: 0, easing: 'linear'},
+      {opacity: 0, offset: 1}
+    ], 150);
+    this.$.ripple.animate([
+      {
+        width: '50%',
+        height: '50%',
+        offset: 0,
+        easing: 'cubic-bezier(0, 0, 0.6, 1)'
+      },
+      {
+        width: '83.0%',
+        height: '83.0%',
+        offset: 1
+      }
+    ], 150);
+    this.$.ripple.animate([
+      {
+        'border-radius': '2px',
+        offset: 0,
+        easing: 'cubic-bezier(0, 0, 0.2, 1)'
+      },
+      {
+        'border-radius': '50%',
+        offset: 1
+      }
+    ], 150);
+
+    this.$.ripple.classList.remove('activated');
+  }
+});