Associate keyboard overlay labels with the controls they label.

chrome/browser/resources/options2/chromeos/keyboard_overlay.html

 <div id="keyboard-overlay" class="page" hidden>
   <div class="close-button"></div>
   <h1 i18n-content="keyboardOverlayTitle"></h1>
   <div class="content-area">
     <table class="option-control-table">
        <tr>
-         <td class="option-name" i18n-content="xkbRemapSearchKeyToContent">
+         <td>
+           <label class="option-name" for="xkb-remap-search-key-to"
+               i18n-content="xkbRemapSearchKeyToContent">
+           </label>
          </td>
          <td class="option-value">
            <select id="xkb-remap-search-key-to" class="control"
-                data-type="number" i18n-options="xkbRemapSearchKeyToValue"
-                pref="settings.language.xkb_remap_search_key_to" dialog-pref>
+               data-type="number" i18n-options="xkbRemapSearchKeyToValue"
+               pref="settings.language.xkb_remap_search_key_to" dialog-pref>
            </select>
          </td>
        </tr>
        <tr>
-         <td class="option-name"
-             i18n-content="xkbRemapControlKeyToContent"></td>
+         <td>
+           <label class="option-name" for="xkb-remap-control-key-to"
+               i18n-content="xkbRemapControlKeyToContent">
+           </label>
+         </td>
          <td class="option-value">
            <select id="xkb-remap-control-key-to" class="control"
-                data-type="number" i18n-options="xkbRemapControlKeyToValue"
-                pref="settings.language.xkb_remap_control_key_to" dialog-pref>
+               data-type="number" i18n-options="xkbRemapControlKeyToValue"
+               pref="settings.language.xkb_remap_control_key_to" dialog-pref>
            </select>
          </td>
        </tr>
        <tr>
-         <td class="option-name" i18n-content="xkbRemapAltKeyToContent"></td>
+         <td>
+           <label class="option-name" for="xkb-remap-alt-key-to"
+               i18n-content="xkbRemapAltKeyToContent">
+           </label>
+         </td>
          <td class="option-value">
            <select id="xkb-remap-alt-key-to" class="control" data-type="number"
-                pref="settings.language.xkb_remap_alt_key_to"
-                i18n-options="xkbRemapAltKeyToValue" dialog-pref></select>
+               pref="settings.language.xkb_remap_alt_key_to"
+               i18n-options="xkbRemapAltKeyToValue" dialog-pref></select>
          </td>
        </tr>
     </table>
   </div>
   <div class="action-area">
     <div class="button-strip">
       <button id="keyboard-cancel" type="reset" i18n-content="cancel"></button>
       <button id="keyboard-confirm" type="submit" i18n-content="ok"></button>
     </div>
   </div>
 </div>