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diff --git a/chrome/browser/transport_security_persister.h b/chrome/browser/transport_security_persister.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// TransportSecurityState maintains an in memory database containing the
+// list of hosts that currently have transport security enabled. This
+// singleton object deals with writing that data out to disk as needed and
+// loading it at startup.
+
+// At startup we need to load the transport security state from the
+// disk. For the moment, we don't want to delay startup for this load, so we
+// let the TransportSecurityState run for a while without being loaded.
+// This means that it's possible for pages opened very quickly not to get the
+// correct transport security information.
+//
+// To load the state, we schedule a Task on the file thread which loads,
+// deserialises and configures the TransportSecurityState.
+//
+// The TransportSecurityState object supports running a callback function
+// when it changes. This object registers the callback, pointing at itself.
+//
+// TransportSecurityState calls...
+// TransportSecurityPersister::StateIsDirty
+//   since the callback isn't allowed to block or reenter, we schedule a Task
+//   on the file thread after some small amount of time
+//
+// ...
+//
+// TransportSecurityPersister::SerialiseState
+//   copies the current state of the TransportSecurityState, serialises
+//   and writes to disk.
+
+#ifndef CHROME_BROWSER_TRANSPORT_SECURITY_PERSISTER_H_
+#define CHROME_BROWSER_TRANSPORT_SECURITY_PERSISTER_H_
+
+#include "base/file_path.h"
+#include "base/lock.h"
+#include "base/ref_counted.h"
+#include "base/task.h"
+#include "net/base/transport_security_state.h"
+
+class TransportSecurityPersister
+    : public base::RefCountedThreadSafe<TransportSecurityPersister>,
+      public net::TransportSecurityState::Delegate {
+ public:
+  TransportSecurityPersister();
+  void Initialize(net::TransportSecurityState* state,
+                  const FilePath& profile_path);
+
+  // Called by the TransportSecurityState when it changes its state.
+  virtual void StateIsDirty(net::TransportSecurityState*);
+
+ private:
+  friend class base::RefCountedThreadSafe<TransportSecurityPersister>;
+
+  ~TransportSecurityPersister();
+
+  void Load();
+  void CompleteLoad(const std::string& state);
+
+  void Save();
+  void CompleteSave(const std::string& state);
+
+  // Used on the IO thread to coalesce writes to disk.
+  ScopedRunnableMethodFactory<TransportSecurityPersister> save_coalescer_;
+
+  scoped_refptr<net::TransportSecurityState>
+      transport_security_state_;  // IO thread only.
+
+  // The path to the file in which we store the serialised state.
+  FilePath state_file_;
+};
+
+#endif  // CHROME_BROWSER_TRANSPORT_SECURITY_PERSISTER_H_