Take 2 at browser_sync::ExtensionsActivityMonitor....

chrome/browser/sync/engine/syncer_session.h

 // 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.
 //
 // SyncerSession holds the entire state of a single sync cycle; GetUpdates,
 // Commit, and Conflict Resolution. After said cycle, the Session may contain
 // items that were unable to be processed because of errors.
 //
 // THIS CLASS PROVIDES NO SYNCHRONIZATION GUARANTEES.
 
 #ifndef CHROME_BROWSER_SYNC_ENGINE_SYNCER_SESSION_H_
 #define CHROME_BROWSER_SYNC_ENGINE_SYNCER_SESSION_H_
 
 #include <utility>
 #include <vector>
 
 #include "base/time.h"
 #include "chrome/browser/sync/engine/net/server_connection_manager.h"
 #include "chrome/browser/sync/engine/sync_cycle_state.h"
 #include "chrome/browser/sync/engine/sync_process_state.h"
 #include "chrome/browser/sync/engine/syncer_status.h"
 #include "chrome/browser/sync/engine/syncer_types.h"
 #include "chrome/browser/sync/engine/syncproto.h"
 #include "chrome/browser/sync/util/event_sys.h"
+#include "chrome/browser/sync/util/extensions_activity_monitor.h"
 #include "chrome/browser/sync/util/sync_types.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"  // For FRIEND_TEST
 
 namespace browser_sync {
 
 class ConflictResolver;
 class ModelSafeWorker;
 class ServerConnectionManager;
 class SyncerStatus;
 struct SyncerEvent;
@@ skipping 265 matching lines @@
     sync_pb::GetUpdatesCallerInfo::GET_UPDATES_SOURCE old_source =
         source_;
     set_source(sync_pb::GetUpdatesCallerInfo::SYNC_CYCLE_CONTINUATION);
     return old_source;
   }
 
   void set_source(sync_pb::GetUpdatesCallerInfo::GET_UPDATES_SOURCE source) {
     source_ = source;
   }
 
+  const ExtensionsActivityMonitor::Records& extensions_activity() const {
+    return extensions_activity_;
+  }
+
+  ExtensionsActivityMonitor::Records* mutable_extensions_activity() {
+    return &extensions_activity_;
+  }
+
   bool notifications_enabled() const {
     return notifications_enabled_;
   }
 
   void set_notifications_enabled(const bool state) {
     notifications_enabled_ = state;
   }
 
   void set_timestamp_dirty() {
     sync_cycle_state_->set_timestamp_dirty();
@@ skipping 28 matching lines @@
   void ClearWriteTransaction() {
     sync_cycle_state_->ClearWriteTransaction();
   }
 
   SyncProcessState* sync_process_state_;
   SyncCycleState* sync_cycle_state_;
 
   // The source for initiating this syncer session.
   sync_pb::GetUpdatesCallerInfo::GET_UPDATES_SOURCE source_;
 
+  // Information about extensions activity since the last successful commit.
+  ExtensionsActivityMonitor::Records extensions_activity_;
+
   // True if notifications are enabled when this session was created.
   bool notifications_enabled_;
 
   FRIEND_TEST(SyncerTest, TestCommitListOrderingCounterexample);
   DISALLOW_COPY_AND_ASSIGN(SyncerSession);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_SESSION_H_