Respect QuicAllowed policy for new streams

chrome/browser/profiles/net_http_session_params_observer.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.

[mmenke, 2017/01/09 16:46:04]

2017, new files should not use the (c).

[pmarko, 2017/01/09 19:53:12]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_PROFILES_NET_HTTP_SESSION_PARAMS_OBSERVER_H_
+#define CHROME_BROWSER_PROFILES_NET_HTTP_SESSION_PARAMS_OBSERVER_H_
+
+#include "base/macros.h"
+#include "components/prefs/pref_member.h"
+#include "net/http/http_network_session.h"
+
+class PrefService;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+// Monitors network-related preferences for changes and applies them to
+// globally owned HttpNetworkSessions.
+// Profile-owned HttpNetworkSessions are taken care of by a
+// UpdateNetParamsCallback passed to the constructor.
+// The supplied PrefService must outlive this NetHttpSessionParamsObserver.
+// Must be used only on the UI thread.
+class NetHttpSessionParamsObserver {
+ public:
+  // Type of callback which will be called when enablement of QUIC is changed.
+  // This callback will be called on the IO thread.
+  typedef base::Callback<void(net::HttpNetworkSession::ParamsUpdate)>
+      UpdateNetParamsCallback;

[mmenke, 2017/01/09 16:46:04]

Need to include callback header (base/???/callback_forward.h)

[pmarko, 2017/01/09 19:53:12]

Done.

+
+  // |prefs| must be non-NULL and |*prefs| must outlive this.
+  // |update_net_params_callback| will be invoked on the IO thread when an
+  // observed network parmeter is changed.
+  NetHttpSessionParamsObserver(
+      PrefService* prefs,
+      UpdateNetParamsCallback update_net_params_callback);
+  ~NetHttpSessionParamsObserver();
+
+  // Register user preferences which NetHttpSessionParamsObserver uses into
+  // |registry|.
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+ private:
+  // Called on UI thread when an observed net pref changes
+  void ApplySettings();
+
+  BooleanPrefMember quic_allowed_;
+  UpdateNetParamsCallback update_net_params_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(NetHttpSessionParamsObserver);
+};
+
+#endif  // CHROME_BROWSER_PROFILES_NET_HTTP_SESSION_PARAMS_OBSERVER_H_