Reskins the Compact and System VK to look closer to the IME VK.

ui/keyboard/resources/elements/kb-keyboard.html

 <!--
   -- Copyright 2013 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.
   -->
 
 <polymer-element name="kb-keyboard" on-key-over="{{keyOver}}"
     on-key-up="{{keyUp}}" on-key-down="{{keyDown}}"
     on-key-longpress="{{keyLongpress}}" on-pointerup="{{up}}"
     on-pointerdown="{{down}}" on-pointerout="{{out}}"
     on-enable-sel="{{enableSel}}" on-enable-dbl="{{enableDbl}}"
     on-key-out="{{keyOut}}" on-set-layout="{{setLayout}}" on-type-key="{{type}}"
     attributes="inputType inputTypeToLayoutMap keyset layout volume">
   <template>
     <style>
       :host {
         -webkit-user-select: none;
-        background-image: -webkit-linear-gradient(#282828, #000000);
-        background-size: cover;
+        background-color: #eeeeee;
         bottom: 0;
         cursor: default;
         left: 0;
         margin: 0;
         overflow: hidden;
         padding: 0;
         position: absolute;
         right: 0;
         top: 0;
       }
     </style>
     <!-- The ID for a keyset follows the naming convention of combining the
       -- layout name with a base keyset name. This convention is used to
       -- allow multiple layouts to be loaded (enablign fast switching) while
       -- allowing the shift and spacebar keys to be common across multiple
       -- keyboard layouts.
       -->
     <content select="kb-keyset" id="content"></content>
     <kb-key-codes id="keyCodeMetadata"></kb-key-codes>
   </template>
 </polymer-element>