Add external data use observer

chrome/browser/io_thread.h

 // Copyright (c) 2012 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_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <map>
 #include <set>
 #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 "base/memory/weak_ptr.h"
 #include "base/prefs/pref_member.h"
 #include "base/strings/string_piece.h"
 #include "base/time/time.h"
 #include "chrome/browser/net/chrome_network_delegate.h"
 #include "chrome/browser/net/ssl_config_service_manager.h"
+#include "components/data_usage/core/data_use_aggregator.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/browser_thread_delegate.h"
 #include "net/base/network_change_notifier.h"
 #include "net/http/http_network_session.h"
 #include "net/socket/next_proto.h"
 
 class PrefProxyConfigTracker;
 class PrefService;
 class PrefRegistrySimple;
 class SystemURLRequestContextGetter;
 
 namespace base {
 class CommandLine;
 }
 
 namespace chrome_browser_net {
 class DnsProbeService;
 }
 
 namespace extensions {
 class EventRouterForwarder;
 }
 
-namespace data_usage {
-class DataUseAggregator;
-}
-
 namespace net {
 class CertPolicyEnforcer;
 class CertVerifier;
 class ChannelIDService;
 class CookieStore;
 class CTVerifier;
 class FtpTransactionFactory;
 class HostMappingRules;
 class HostResolver;
 class HttpAuthHandlerFactory;
@@ skipping 59 matching lines @@
       explicit SystemRequestContextLeakChecker(Globals* globals);
       ~SystemRequestContextLeakChecker();
 
      private:
       Globals* const globals_;
     };
 
     Globals();
     ~Globals();
 
-    // Global aggregator of data use. It must outlive the
-    // |system_network_delegate|.
-    scoped_ptr<data_usage::DataUseAggregator> data_use_aggregator;
     // The "system" NetworkDelegate, used for Profile-agnostic network events.
     scoped_ptr<net::NetworkDelegate> system_network_delegate;
     scoped_ptr<net::HostResolver> host_resolver;
     scoped_ptr<net::CertVerifier> cert_verifier;
     // The ChannelIDService must outlive the HttpTransactionFactory.
     scoped_ptr<net::ChannelIDService> system_channel_id_service;
     // This TransportSecurityState doesn't load or save any state. It's only
     // used to enforce pinning for system requests and will only use built-in
     // pins.
     scoped_ptr<net::TransportSecurityState> transport_security_state;
@@ skipping 103 matching lines @@
 
   // Clears the host cache.  Intended to be used to prevent exposing recently
   // visited sites on about:net-internals/#dns and about:dns pages.  Must be
   // called on the IO thread.
   void ClearHostCache();
 
   void InitializeNetworkSessionParams(net::HttpNetworkSession::Params* params);
 
   base::TimeTicks creation_time() const;
 
+  data_usage::DataUseAggregator* data_use_aggregator() const;
+
   // Returns true if QUIC should be enabled for data reduction proxy, either as
   // a result of a field trial or a command line flag.
   static bool ShouldEnableQuicForDataReductionProxy();
 
  private:
   // Map from name to value for all parameters associate with a field trial.
   typedef std::map<std::string, std::string> VariationParameters;
 
   // Provide SystemURLRequestContextGetter with access to
   // InitSystemRequestContext().
@@ skipping 241 matching lines @@
 
   scoped_refptr<net::URLRequestContextGetter>
       system_url_request_context_getter_;
 
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
   // True if QUIC is allowed by policy.
   bool is_quic_allowed_by_policy_;
 
+  // Global aggregator of data use. It must outlive the
+  // |system_network_delegate|.
+  scoped_ptr<data_usage::DataUseAggregator> data_use_aggregator_;
+  // An external observer of data use.
+  scoped_ptr<data_usage::DataUseAggregator::Observer>
+      external_data_use_observer_;
+
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_