[Chromecast] Add cookie settings to CastNetworkContexts.

Previously no cookie settings were provided when NetworkContext was
created, and the default in-memory cookie store was used. Provide a
cookie path so that the on-disk cookie store is used.

Bug: internal b/177479549
Test: Launch YT on device and verified cookies survived reboot.
Change-Id: Icf6ac063ffc0fc13de36bb6dd6b62edc8e4496a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631358Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Junbo Ke <juke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844123}

chromecast/browser/cast_network_contexts.cc

@@ -30,6 +30,10 @@
 namespace chromecast {
 namespace shell {
 
+namespace {
+constexpr char kCookieStoreFile[] = "Cookies";
+}  // namespace
+
 // SharedURLLoaderFactory backed by a CastNetworkContexts and its system
 // NetworkContext. Transparently handles crashes.
 class CastNetworkContexts::URLLoaderFactoryForSystem
@@ -193,6 +197,13 @@ void CastNetworkContexts::ConfigureDefaultNetworkContextParams(
   network_context_params->accept_language =
       CastHttpUserAgentSettings::AcceptLanguage();
 
+  auto* browser_context = CastBrowserProcess::GetInstance()->browser_context();
+  DCHECK(browser_context);
+  network_context_params->cookie_path =
+      browser_context->GetPath().Append(kCookieStoreFile);
+  network_context_params->restore_old_session_cookies = false;
+  network_context_params->persist_session_cookies = true;
+
   // Disable idle sockets close on memory pressure, if instructed by DCS. On
   // memory constrained devices:
   // 1. if idle sockets are closed when memory pressure happens, cast_shell will