MD Settings: Display spinner and disable buttons while clearing browsing data.

chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html

Index: chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
diff --git a/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html b/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
index b9a9bda3c377af66e5defaec3cab5bfc5e3b7442..6b164f44d7eb077a8c3f06c8c02059e6d10fbe02 100644
--- a/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
+++ b/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
@@ -1,6 +1,7 @@
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="chrome://md-settings/i18n_setup.html">
 <link rel="import" href="chrome://md-settings/clear_browsing_data_dialog/clear_browsing_data_browser_proxy.html">
 <link rel="import" href="chrome://md-settings/controls/settings_checkbox.html">
@@ -10,7 +11,13 @@
 
 <dom-module id="settings-clear-browsing-data-dialog">
   <template>
-    <style include="settings-shared"></style>
+    <style include="settings-shared">
+      paper-spinner {
+        margin-bottom: auto;
+        margin-top: auto;
+        -webkit-margin-end: 16px;
+      }
+    </style>
     <settings-dialog id="dialog">
       <div class="title" i18n-content="clearBrowsingData"></div>
       <div class="body">
@@ -55,10 +62,11 @@
         </settings-checkbox>
       </div>
       <div class="button-container">
+        <paper-spinner active="[[clearingInProgress_]]"></paper-spinner>
         <paper-button class="cancel-button" i18n-content="cancel"
-            dialog-dismiss></paper-button>
-        <paper-button class="action-button" id="clearBrowsingData"
-            i18n-content="clearBrowsingData" on-tap="onClearBrowsingDataTap_">
+            dialog-dismiss disabled="[[clearingInProgress_]]"></paper-button>
+        <paper-button class="action-button" i18n-content="clearBrowsingData"
+            on-tap="onClearBrowsingDataTap_" disabled="[[clearingInProgress_]]">
         </paper-button>
       </div>
       <div class="footer">