Allow script to request durable storage permission (chrome side)

chrome/browser/extensions/extension_special_storage_policy.cc

Index: chrome/browser/extensions/extension_special_storage_policy.cc
diff --git a/chrome/browser/extensions/extension_special_storage_policy.cc b/chrome/browser/extensions/extension_special_storage_policy.cc
index 076273c99b74b1e9d80abe06b553f43dbc2a605c..40860a2dc28cb88f17425ecc71fd174887bcb1d7 100644
--- a/chrome/browser/extensions/extension_special_storage_policy.cc
+++ b/chrome/browser/extensions/extension_special_storage_policy.cc
@@ -136,6 +136,18 @@ bool ExtensionSpecialStoragePolicy::HasIsolatedStorage(const GURL& origin) {
   return isolated_extensions_.Contains(origin);
 }
 
+bool ExtensionSpecialStoragePolicy::IsStorageDurable(const GURL& origin) {
+  ContentSettingsForOneType entries;
+  cookie_settings_->GetDurableSettings(&entries);
+  for (size_t i = 0; i < entries.size(); ++i) {
+    if (!entries[i].primary_pattern.Matches(origin))
+      continue;
+    // TODO(dgrogan): How should this use secondary_pattern?
+    return entries[i].setting == CONTENT_SETTING_ALLOW;
+  }
+  return false;
+}
+
 bool ExtensionSpecialStoragePolicy::NeedsProtection(
     const extensions::Extension* extension) {
   return extension->is_hosted_app() && !extension->from_bookmark();