MD History: Hide sign in guide in guest mode

Hide sign in guide in guest mode and show 'no synced tabs'.

BUG=628102
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2171513004
Cr-Commit-Position: refs/heads/master@{#407009}

chrome/browser/resources/md_history/synced_device_manager.html

@@ -73,10 +73,12 @@
       </template>
     </div>
     <div id="no-synced-tabs" class="centered-message"
-      hidden="[[!showNoSyncedMessage(signInState_, syncedDevices_.length)]]">
+        hidden="[[!showNoSyncedMessage(signInState_, syncedDevices_.length,
+                                       guestSession_)]]">
       [[noSyncedTabsMessage(fetchingSyncedTabs_)]]
     </div>
-    <div id="sign-in-guide" hidden$="[[signInState_]]">
+    <div id="sign-in-guide"
+        hidden="[[!showSignInGuide(signInState_, guestSession_)]]">
       <div id="illustration"></div>
       <div id="sign-in-promo">$i18n{signInPromo}</div>
       <div id="sign-in-promo-desc">$i18n{signInPromoDesc}</div>

chrome/browser/resources/md_history/synced_device_manager.js

@@ -44,6 +44,12 @@ Polymer({
       value: loadTimeData.getBoolean('isUserSignedIn'),
     },
 
+    /** @private */
+    guestSession_: {
+      type: Boolean,
+      value: loadTimeData.getBoolean('isGuestSession'),
+    },
+
     /** @private */
     fetchingSyncedTabs_: {
       type: Boolean,
@@ -108,12 +114,28 @@ Polymer({
    * Decide whether or not should display no synced tabs message.
    * @param {boolean} signInState
    * @param {number} syncedDevicesLength
+   * @param {boolean} guestSession
    * @return {boolean}
    */
-  showNoSyncedMessage: function(signInState, syncedDevicesLength) {
+  showNoSyncedMessage: function(
+      signInState, syncedDevicesLength, guestSession) {
+    if (guestSession)
+      return true;
+
     return signInState && syncedDevicesLength == 0;
   },
 
+  /**
+   * Shows the signin guide when the user is not signed in and not in a guest
+   * session.
+   * @param {boolean} signInState
+   * @param {boolean} guestSession
+   * @return {boolean}
+   */
+  showSignInGuide: function(signInState, guestSession) {
+    return !signInState && !guestSession;
+  },
+
   /**
    * Decide what message should be displayed when user is logged in and there
    * are no synced tabs.

chrome/browser/ui/webui/md_history_ui.cc

@@ -101,6 +101,8 @@ content::WebUIDataSource* CreateMdHistoryUIHTMLSource(Profile* profile) {
       switches::kHistoryEnableGroupByDomain) || profile->IsSupervised();
   source->AddBoolean("groupByDomain", group_by_domain);
 
+  source->AddBoolean("isGuestSession", profile->IsGuestSession());
+
   SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfile(profile);
   bool is_authenticated = signin_manager != nullptr &&

chrome/test/data/webui/md_history/history_synced_tabs_test.js

@@ -253,9 +253,17 @@ cr.define('md_history.history_synced_tabs_test', function() {
         });
       });
 
+      test('hide sign in promo in guest mode', function() {
+        element.guestSession_ = true;
+        return flush().then(function() {
+          assertTrue(element.$['sign-in-guide'].hidden);
+        });
+      });
+
       teardown(function() {
         element.syncedDevices = [];
         element.searchTerm = '';
+        element.guestSession_ = false;
       });
     });
   }