[Offline Pages] Adding metadatas for namespace async_loading.

components/offline_pages/client_policy_controller.cc

Index: components/offline_pages/client_policy_controller.cc
diff --git a/components/offline_pages/client_policy_controller.cc b/components/offline_pages/client_policy_controller.cc
index 0d1e114d41ca631b7bb291d65aaa313e27f60401..dd4785b5279d990990651524b98f6f2d280d0885 100644
--- a/components/offline_pages/client_policy_controller.cc
+++ b/components/offline_pages/client_policy_controller.cc
@@ -24,6 +24,10 @@ ClientPolicyController::ClientPolicyController() {
       kLastNNamespace,
       MakePolicy(kLastNNamespace, LifetimeType::TEMPORARY,
                  base::TimeDelta::FromDays(2), kUnlimitedPages, 1)));
+  policies_.insert(std::make_pair(
+      kAsyncNamespace, MakePolicy(kAsyncNamespace, LifetimeType::TEMPORARY,

[fgorski, 2016/07/01 19:26:09]

They should be LifetimeType::PERSISTENT.

[romax, 2016/07/06 22:03:28]

I'm not against to change it to persistent. However I don't see us having a
mechanism to delete persistent pages now. It means if we mark it as persistent
and make it have an infinite expiration_period (which is a good thing to do),
there's no way to delete them unless wipe all pages. So I'm not sure if I should
do this and add a check when expiring pages *for now*. Also please let me know
if we have something for user to delete persistent pages, if there is one, I'm
more than happy to finish the changes.

[fgorski, 2016/07/07 17:01:45]

We are not done with the feature. Downloads home is where we will be able to
delete the pages from. I believe it should already be doable from then clear
browsing data (or similar settings page).
Also, for development you can do it from chrome://offline-internals.

+                                  base::TimeDelta::FromDays(2), kUnlimitedPages,

[fgorski, 2016/07/01 19:26:09]

We need to make sure we have an infinite expiration_period.
Unless we ignore it already for persistent lifetime.

[romax, 2016/07/06 22:03:27]

please see previous comment.

+                                  kUnlimitedPages)));
   // Fallback policy.
   policies_.insert(std::make_pair(
       kDefaultNamespace, MakePolicy(kDefaultNamespace, LifetimeType::TEMPORARY,