Notify DataUseTabModel of navigations and tab closures

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>
@@ skipping 20 matching lines @@
 class PrefRegistrySimple;
 class SystemURLRequestContextGetter;
 
 namespace base {
 class CommandLine;
 }
 
 #if defined(OS_ANDROID)
 namespace chrome {
 namespace android {
+class DataUseTabModel;
 class ExternalDataUseObserver;
 }
 }
 #endif  // defined(OS_ANDROID)
 
 namespace chrome_browser_net {
 class DnsProbeService;
 }
 
 namespace data_usage {
@@ skipping 217 matching lines @@
   void ClearHostCache();
 
   void InitializeNetworkSessionParams(net::HttpNetworkSession::Params* params);
 
   base::TimeTicks creation_time() 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();
 
+#if defined(OS_ANDROID)
+  base::WeakPtr<chrome::android::DataUseTabModel> data_use_tab_model() const {
+    return data_use_tab_model_;
+  }
+#endif  // defined(OS_ANDROID)
+
  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().
   friend class SystemURLRequestContextGetter;
 
   friend class test::IOThreadPeer;
 
@@ skipping 242 matching lines @@
       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_;
 
   const base::TimeTicks creation_time_;
 
+#if defined(OS_ANDROID)
+  // WeakPtr to DataUseTabModel to be used on IO thread.

[sclittle, 2015/11/24 23:07:37]

Please be more specific - data_use_tab_model_ should only be dereferenced on the
IO thread, but should only be accessed on the UI thread after IOThread::Init ran
on the IO thread.

[tbansal1, 2015/11/25 20:55:16]

Obsolete.

+  base::WeakPtr<chrome::android::DataUseTabModel> data_use_tab_model_;
+#endif  // defined(OS_ANDROID)
+
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_