Changes shift key icon & highlight/caps UX.

ui/keyboard/resources/layouts/system-qwerty.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.
   -->
 
 <kb-keyset id="system-qwerty-upper" align="center">
   <kb-row>
     <kb-key-sequence invert=true keys="`1234567890-="
         hintTexts="~!@#$%^&*()_+"> </kb-key-sequence>
     <kb-key class="dark" char="&#x0008;" repeat align="right"
         image="backspace.png" sound="keypress-delete" stretch weight="190">
     </kb-key>
   </kb-row>
   <kb-row align="left">
-    <kb-key class="dark" char="&#x0009;" align="center"
+    <kb-key class="dark tab" char="&#x0009;" align="center"
         image="tab.png" weight="155"></kb-key>
     <kb-key-sequence keys="QWERTYUIOP"></kb-key-sequence>
     <kb-key-sequence invert=true keys="[]\"
         hintTexts="{}|"></kb-key-sequence>
   </kb-row>
   <kb-row>
-    <kb-key class="search dark" char="Search" image='search'
+    <kb-key class="search dark" char="Search" image='search.png'
         weight="210"> </kb-key>
     <kb-key-sequence keys="ASDFGHJKL"></kb-key-sequence>
     <kb-key-sequence invert=true keys=";&apos;" hintTexts=':"'>
     </kb-key-sequence>
     <kb-key class="dark" char="&#x000A;" align="right"
         image="return.png" sound="keypress-return" stretch weight="170"></kb-key>
   </kb-row>
   <kb-row>
     <kb-shift-key weight="265" align="left"></kb-shift-key>
     <kb-key-sequence keys="ZXCVBNM"></kb-key-sequence>
@@ skipping 26 matching lines @@
 
 <kb-keyset id="system-qwerty-lower" align="center" isDefault=true>
   <kb-row>
     <kb-key-sequence keys="`1234567890-=" hintTexts="~!@#$%^&*()_+">
     </kb-key-sequence>
     <kb-key class="dark" weight="190" char="&#x0008;"
         image="backspace.png" repeat sound="keypress-delete" stretch
         align="right"></kb-key>
   </kb-row>
   <kb-row align="left">
-    <kb-key class="dark" char="&#x0009;" align="center"
+    <kb-key class="dark tab" char="&#x0009;" align="center"
         image="tab.png" weight="155"></kb-key>
     <kb-key-sequence keys="qwertyuiop"></kb-key-sequence>
     <kb-key-sequence keys="[]\" hintTexts="{}|"></kb-key-sequence>
   </kb-row>
   <kb-row>
-    <kb-key class="search dark" char="Search" image='search'
+    <kb-key class="search dark" char="Search" image='search.png'
         weight="210"></kb-key>
     <kb-key-sequence keys="asdfghjkl"></kb-key-sequence>
     <kb-key-sequence keys=";&apos;" hintTexts=':"'></kb-key-sequence>
     <kb-key class="dark" char="&#x000A;" align="right"
         image="return.png" sound="keypress-return" stretch weight="170">
     </kb-key>
   </kb-row>
   <kb-row>
     <kb-shift-key weight="265" align="left"></kb-shift-key>
     <kb-key-sequence keys="zxcvbnm"></kb-key-sequence>
@@ skipping 15 matching lines @@
     <kb-key class="cursor dark" repeat char="Arrow-Down" image="down"
         weight="75"> </kb-key>
     <kb-key class="cursor dark" repeat char="Arrow-Right" image="right"
         weight="75"></kb-key>
     <kb-hide-keyboard-key image="hide-keyboard.png" stretch>
     </kb-hide-keyboard-key>
   </kb-row>
   <kb-altkey-container hidden>
   </kb-altkey-container>
 </kb-keyset>