Add a Rappor option in the settings page.

chrome/browser/resources/options/browser_options.html

 <div id="settings" class="page" hidden>
   <header>
     <h1 i18n-content="settingsTitle"></h1>
   </header>
   <include src="reset_profile_settings_banner.html">
   <include src="automatic_settings_reset_banner.html">
 <if expr="chromeos">
   <include src="secondary_user_banner.html">
   <section>
     <div id="network-section-header" class="section-header">
@@ skipping 434 matching lines @@
                 class="controlled-setting-indicator"></span>
           </span>
         </label>
         <span id="metrics-reporting-reset-restart">
           <!-- Text filled by JavaScript -->
           <span></span><a is="action-link" role="button"
               class="standalone-action-link"></a><span></span>
         </span>
 </if>
       </div>
+      <div class="checkbox controlled-setting-with-label">
+        <label>
+          <input pref="rappor.enabled" type="checkbox"
+              metric="Options_RapporEnabledCheckbox">
+          <span>
+            <span i18n-values=".innerHTML:enableRappor"></span>
+            <span class="controlled-setting-indicator"
+                pref="rappor.enabled"></span>
+          </span>
+        </label>
+      <div>
 </if>  <!-- _google_chrome -->
       <div class="checkbox">
         <label>
           <input id="do-not-track-enabled" pref="enable_do_not_track"
               metric="Options_DoNotTrackCheckbox" type="checkbox" dialog-pref>
           <span i18n-content="doNotTrack"></span>
         </label>
       </div>
 <if expr="chromeos">
       <div class="checkbox controlled-setting-with-label">
@@ skipping 539 matching lines @@
       </button>
     </div>
   </section>
   </div>  <!-- advanced-settings-container -->
   </div>  <!-- advanced-settings -->
   <footer id="advanced-settings-footer">
     <a is="action-link" id="advanced-settings-expander"
         i18n-content="showAdvancedSettings"></a>
   </footer>
 </div>