Site Settings Desktop: Implement tri-state 'Delete local data on exit'.

chrome/browser/resources/settings/site_settings/site_settings_category.html

Index: chrome/browser/resources/settings/site_settings/site_settings_category.html
diff --git a/chrome/browser/resources/settings/site_settings/site_settings_category.html b/chrome/browser/resources/settings/site_settings/site_settings_category.html
index d005a33db9050312b5ab790583281c6e04e0c99b..c25dfbf83490cefc204af9ec2f9f517269779b65 100644
--- a/chrome/browser/resources/settings/site_settings/site_settings_category.html
+++ b/chrome/browser/resources/settings/site_settings/site_settings_category.html
@@ -46,7 +46,16 @@
           on-change="onChangePermissionControl_"></paper-toggle-button>
     </div>
 
-    <content select=".cookie-controls"></content>
+    <template is="dom-if" if="[[isCookiesCategory_(category)]]">
+      <div class="settings-box">
+        <paper-checkbox id="sessionOnlyCheckbox"
+            checked="{{cookiesSessionOnly_}}"
+            on-change="onChangePermissionControl_"
+            disabled="[[!categoryEnabled]]">

[dschuyler, 2016/09/06 18:36:43]

nit: consider unwrapping this line to fewer lines.

[Finnur, 2016/09/08 09:59:39]

Done.

+          <div>$i18n{deleteDataPostSession}</div>
+        </paper-checkbox>
+      </div>
+    </template>
 
     <template is="dom-if" if="[[isFlashCategory_(category)]]">
       <div class="settings-box two-line">
@@ -59,6 +68,8 @@
       </div>
     </template>
 
+    <content select=".cookie-controls"></content>
+
     <div class="settings-box layout horizontal">
 <if expr="chromeos">
       <div class="flex" hidden$="[[!isPluginCategory_(category)]]">