MD Settings: About page, hooking up channel switcher dialog.

chrome/browser/resources/settings/about_page/about_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/about_page/about_page_browser_proxy.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_section.html">
 <link rel="import" href="/settings_page_css.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
@@ skipping 60 matching lines @@
               <div hidden="[[!shouldShowUpdateStatus_(
                   currentUpdateStatusEvent_)]]">
                 <iron-icon
                     icon$="[[getIcon_(currentUpdateStatusEvent_)]]"
                     src="[[getIconSrc_(currentUpdateStatusEvent_)]]">
                 </iron-icon>
               </div>
               <div class="start">
                 <div hidden="[[!shouldShowUpdateStatus_(
                     currentUpdateStatusEvent_)]]">
-                  [[getUpdateStatusMessage_(currentUpdateStatusEvent_)]]
+                  [[getUpdateStatusMessage_(
+                      currentUpdateStatusEvent_, targetChannel_)]]
                 </div>
                 <div class="secondary">$i18n{aboutBrowserVersion}</div>
               </div>
               <paper-button id="relaunch" class="secondary-action"
+<if expr="not chromeos">
                   hidden="[[!shouldShowRelaunch_(currentUpdateStatusEvent_)]]"
+</if>
+<if expr="chromeos">
+                  hidden="[[!shouldShowRelaunch_(
+                      currentUpdateStatusEvent_, targetChannel_)]]"
+</if>
                   on-tap="onRelaunchTap_">
                 $i18n{aboutRelaunch}
               </paper-button>
 <if expr="chromeos">
               <paper-button id="relaunchAndPowerwash" class="secondary-action"
                   hidden="[[!shouldShowRelaunchAndPowerwash_(
-                    currentUpdateStatusEvent_)]]"
+                      currentUpdateStatusEvent_, targetChannel_)]]"
                   on-tap="onRelaunchAndPowerwashTap_">
                 $i18n{aboutRelaunchAndPowerwash}
               </paper-button>
               <paper-button id="checkForUpdates" class="secondary-action"
-                  hidden="[[!shouldShowCheckUpdates_(
-                    currentUpdateStatusEvent_)]]"
+                  hidden="[[!shouldShowCheckUpdates_(currentUpdateStatusEvent_)]]"
                   on-tap="onCheckUpdatesTap_">
                 $i18n{aboutCheckForUpdates}
               </paper-button>
 </if>
             </div>
             <div id="help" class="settings-box two-line" on-tap="onHelpTap_">
               $i18n{aboutGetHelpUsingChrome}
             </div>
 <if expr="_google_chrome">
             <div id="reportIssue" class="settings-box"
@@ skipping 36 matching lines @@
               <settings-detailed-build-info></settings-detailed-build-info>
             </settings-subpage>
           </template>
 </if>
         </settings-animated-pages>
       </settings-section>
     </div>
   </template>
   <script src="about_page.js"></script>
 </dom-module>