Fix accessibility issues in AudioPlayer and VideoPlayer.

ui/file_manager/audio_player/elements/control_panel.html

 <!--
   -- 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.
   -->
 
 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/font-roboto/roboto.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-slider/paper-slider.html">
-<link rel="import" href="chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/foreground/elements/files_ripple.html">
-<link rel="import" href="chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/foreground/elements/files_toggle_ripple.html">
+<link rel="import" href="chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/foreground/elements/files_icon_button.html">
 
 <dom-module id="control-panel">
   <link rel="import" type="css" href="control_panel.css">
   <template>
     <div class="controls">
       <div class="control-row volume-controls" hidden="[[!volumeSliderShown]]">
         <paper-slider id="volumeSlider" value="{{volume::change}}"></paper-slider>
       </div>
       <div class="control-row audio-controls">
         <!-- Shuffle toggle button in the bottom line. -->
-        <button class="shuffle-mode media-button toggle" state="default">
-          <label>
-            <input id="shuffleCheckbox"
-                   type="checkbox"
-                   checked="{{shuffle::change}}">
-            <span class="icon"></span>
-          </label>
-          <files-toggle-ripple activated="[[shuffle]]"></files-toggle-ripple>
-        </button>
+        <files-icon-button toggles
+            id="shuffle"
+            class="shuffle-mode media-button toggle"
+            active="{{shuffle}}">
+        </files-icon-button>
 
         <!-- Repeat toggle button in the bottom line. -->
-        <button class="repeat media-button toggle" state="default">
-          <label>
-            <input id="repeatCheckbox"
-                   type="checkbox"
-                   checked="{{repeat::change}}">
-            <span class="icon"></span>
-          </label>
-          <files-toggle-ripple activated="[[repeat]]"></files-toggle-ripple>
-        </button>
+        <files-icon-button toggles
+            id="repeat"
+            class="repeat media-button toggle"
+            active="{{repeat}}">
+        </files-icon-button>
 
         <!-- Prev button in the bottom line. -->
-        <button class="previous media-button"
-               state="default"
-               on-click="previousClick">
-          <div class="normal default"></div>
-          <div class="disabled"></div>
-          <files-ripple></files-ripple>
-        </button>
+        <files-icon-button
+            id="previous"
+            class="previous media-button"
+            on-click="previousClick">
+        </files-icon-button>
 
         <!-- Play button in the bottom line. -->
-        <button class="play media-button"
-                state$="[[computePlayState_(playing)]]"
-                on-click="playClick">
-          <div class="normal playing"></div>
-          <div class="normal ended"></div>
-          <div class="disabled"></div>
-          <files-ripple></files-ripple>
-        </button>
+        <files-icon-button
+            id="play"
+            class="play media-button"
+            on-click="playClick">
+        </files-icon-button>
 
         <!-- Next button in the bottom line. -->
-        <button class="next media-button"
-                state="default"
-                on-click="nextClick">
-          <div class="normal default"></div>
-          <div class="disabled"></div>
-          <files-ripple></files-ripple>
-        </button>
+        <files-icon-button
+            id="next"
+            class="next media-button"
+            on-click="nextClick">
+        </files-icon-button>
 
         <!-- Volume button in the bottom line. -->
-        <button id="volumeButton"
-                class="volume media-button toggle"
-                state="default"
-                anchor-point="bottom center">
-          <label>
-            <input type="checkbox" checked="{{volumeSliderShown::change}}">
-            <span class="icon"></span>
-          </label>
-          <files-toggle-ripple activated="[[volumeSliderShown]]"></files-toggle-ripple>
-        </button>
+        <files-icon-button toggles
+            id="volume"
+            class="volume media-button toggle"
+            anchor-point="bottom center"
+            active="{{volumeSliderShown}}">
+        </files-icon-button>
 
         <!-- Playlist button in the bottom line. -->
-        <button id="playlistButton"
-                class="playlist media-button toggle"
-                state="default">
-          <label>
-            <input type="checkbox" checked="{{expanded::change}}">
-            <span class="icon"></span>
-          </label>
-          <files-toggle-ripple activated="[[expanded]]"></files-toggle-ripple>
-        </button>
+        <files-icon-button toggles
+            id="playList"
+            class="playlist media-button toggle"
+            active="{{expanded}}">
+        </files-toggle-ripple>
       </div>
       <div class="control-row time-controls">
         <div class="time-container">
           <div class="time-spacer">[[computeTimeString_(duration, duration)]]</div>
           <div class="time">[[computeTimeString_(time, duration)]]</div>
         </div>
         <paper-slider id="timeSlider" max="[[duration]]" value="{{time::change}}"></paper-slider>
       </div>
     </div>
   </template>
 </dom-module>
 
 <script src="control_panel.js"></script>