[Sync] Store the past 10 traffic records in memory.

sync/sessions/sync_session_context.cc

 // 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.
 
 #include "sync/sessions/sync_session_context.h"
 
 #include "sync/sessions/debug_info_getter.h"
 #include "sync/sessions/session_state.h"
 #include "sync/util/extensions_activity_monitor.h"
 
 namespace browser_sync {
 namespace sessions {
 
+const unsigned int kMaxMessagesToRecord = 10;
+const unsigned int kMaxMessageSizeToRecord = 5 * 1024;
+
 SyncSessionContext::SyncSessionContext(
     ServerConnectionManager* connection_manager,
     syncable::Directory* directory,
     ModelSafeWorkerRegistrar* model_safe_worker_registrar,
     ExtensionsActivityMonitor* extensions_activity_monitor,
     const std::vector<SyncEngineEventListener*>& listeners,
     DebugInfoGetter* debug_info_getter)
     : resolver_(NULL),
       connection_manager_(connection_manager),
       directory_(directory),
       registrar_(model_safe_worker_registrar),
       extensions_activity_monitor_(extensions_activity_monitor),
       notifications_enabled_(false),
       max_commit_batch_size_(kDefaultMaxCommitBatchSize),
-      debug_info_getter_(debug_info_getter) {
+      debug_info_getter_(debug_info_getter),
+      traffic_recorder_(kMaxMessagesToRecord, kMaxMessageSizeToRecord) {
   std::vector<SyncEngineEventListener*>::const_iterator it;
   for (it = listeners.begin(); it != listeners.end(); ++it)
     listeners_.AddObserver(*it);
 }
 
 SyncSessionContext::SyncSessionContext()
     : connection_manager_(NULL),
       directory_(NULL),
       registrar_(NULL),
       extensions_activity_monitor_(NULL),
-      debug_info_getter_(NULL) {
+      debug_info_getter_(NULL),
+      traffic_recorder_(kMaxMessagesToRecord, kMaxMessageSizeToRecord) {
 }
 
 SyncSessionContext::~SyncSessionContext() {
 }
 
 void SyncSessionContext::SetUnthrottleTime(syncable::ModelTypeSet types,
                                            const base::TimeTicks& time) {
   for (syncable::ModelTypeSet::Iterator it = types.First();
        it.Good(); it.Inc()) {
     unthrottle_times_[it.Get()] = time;
@@ skipping 22 matching lines @@
   for (UnthrottleTimes::const_iterator it = unthrottle_times_.begin();
        it != unthrottle_times_.end();
        ++it) {
     types.Put(it->first);
   }
   return types;
 }
 
 }  // namespace sessions
 }  // namespace browser_sync