Expand the footer in the material design Clear Browsing Data dialog.

chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js

Index: chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js
diff --git a/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js b/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js
index 381b54fa47a5c5139a48b213d48722df2b386254..301845772cbdae9c96e5da5a641fd61aae873b9e 100644
--- a/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js
+++ b/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js
@@ -49,10 +49,20 @@ Polymer({
     this.addWebUIListener(
         'browsing-history-pref-changed',
         this.setAllowDeletingHistory_.bind(this));
+    this.addWebUIListener(
+        'update-footer',
+        this.updateFooter_.bind(this));
     this.browserProxy_ =
         settings.ClearBrowsingDataBrowserProxyImpl.getInstance();
   },
 
+  /** @override */
+  attached: function() {

[dschuyler, 2016/04/26 17:29:49]

Can this be started earlier from ready() rather
than waiting for attached()?

[msramek, 2016/04/27 18:10:29]

Done. Yes, thanks for pointing this out!

+    // Initialize the footer. This is done by simply calling updateFooter_,
+    // however, the C++ side must provide arguments.
+    this.browserProxy_.initializeFooter();
+  },
+
   /**
    * @param {boolean} allowed Whether the user is allowed to delete histories.
    * @private
@@ -66,6 +76,19 @@ Polymer({
     }
   },
 
+  /**
+   * Updates the footer. Shows only those sentences that are relevant to this
+   * user.
+   * @param {boolean} syncing Whether the user is syncing data.
+   * @param {boolean} otherFormsOfBrowsingHistory Whether the user has other
+   *     forms of browsing history in their account.
+   * @private
+   */
+  updateFooter_: function(syncing, otherFormsOfBrowsingHistory) {
+    this.$.googleFooter.hidden = !otherFormsOfBrowsingHistory;
+    this.$.syncedDataSentence.hidden = !syncing;
+  },
+
   open: function() {
     this.$.dialog.open();
   },