Introduced the URLBlacklistManager, and wired it to various places.

chrome/browser/policy/host_blacklist_manager.h

Index: chrome/browser/policy/host_blacklist_manager.h
diff --git a/chrome/browser/policy/host_blacklist_manager.h b/chrome/browser/policy/host_blacklist_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..db6f6e04ea2d756d64ee9c17a6921ccea4707bcc
--- /dev/null
+++ b/chrome/browser/policy/host_blacklist_manager.h
@@ -0,0 +1,97 @@
+// Copyright (c) 2011 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.
+
+#ifndef CHROME_BROWSER_POLICY_HOST_BLACKLIST_MANAGER_H_
+#define CHROME_BROWSER_POLICY_HOST_BLACKLIST_MANAGER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
+#include "content/common/notification_observer.h"
+
+class CancelableTask;
+class GURL;
+class NotificationDetails;
+class NotificationSource;
+class PrefService;
+class Profile;
+
+namespace base {
+class ListValue;
+}
+
+namespace policy {
+
+// Tracks the blacklist policies for a given profile, and updates it on changes.
+class HostBlacklistManager
+    : public base::RefCountedThreadSafe<HostBlacklistManager>,
+      public NotificationObserver {
+ public:
+  explicit HostBlacklistManager(Profile* profile);
+
+  // Call once to initialize the service on the UI thread.
+  // This is a separate method because it involves adding a ref to |this|
+  // (through NewRunnableMethod), which isn't allowed in the ctor.
+  void Initialize();
+
+  // Called on shutdown or destruction of the profile. The
+  // ChromeNetworkDelegate can still hold a reference to |this| on the IO thread
+  // but the PrefChangeRegistrar must clean up on the UI thread.
+  // After calling ShutdownOnUIThread(), the blacklist will still be enforced
+  // but it won't react to updates of the policies.
+  void ShutdownOnUIThread();
+
+  // Returns true if |url| is blocked by the current blacklist. This must only
+  // be invoked from the IO thread.
+  bool ShouldBlockRequest(const GURL& url) const;
+
+  // Registers the preferences related to blacklisting in the given PrefService.
+  static void RegisterPrefs(PrefService* pref_service);
+
+ private:
+  friend class base::RefCountedThreadSafe<HostBlacklistManager>;
+  friend class BuildBlacklistTask;
+  friend class SetBlacklistTask;
+  friend class TestingHostBlacklistManager;
+
+  class Blacklist;
+
+  virtual ~HostBlacklistManager();
+
+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
+
+  void ScheduleUpdate();
+  virtual void PostUpdateTask();  // Virtual for testing.
+  virtual void Update();  // Virtual for testing.
+
+  void BuildBlacklist(const std::vector<std::string>* blacklist,
+                      const std::vector<std::string>* whitelist);
+  void SetBlacklist(Blacklist* blacklist);
+
+  // Non NULL when a pending update task exists. This is only modified on
+  // the UI thread, and is used to avoid duplicate updates when both policies
+  // change at the same time.
+  CancelableTask* update_task_;
+
+  // Used to track the policies and update the blacklist on changes.
+  PrefChangeRegistrar pref_change_registrar_;
+  PrefService* pref_service_;  // Weak.
+
+  // The current blacklist. Lives in the IO thread.
+  scoped_ptr<Blacklist> blacklist_;
+
+  DISALLOW_COPY_AND_ASSIGN(HostBlacklistManager);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_HOST_BLACKLIST_MANAGER_H_