[Sync] Add support for server-controlled favicon sync limit

chrome/browser/sync/glue/session_model_associator.cc

 // Copyright 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 "chrome/browser/sync/glue/session_model_associator.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 85 matching lines @@
     DataTypeErrorHandler* error_handler)
     : tab_pool_(sync_service),
       local_session_syncid_(syncer::kInvalidId),
       sync_service_(sync_service),
       stale_session_threshold_days_(kDefaultStaleSessionThresholdDays),
       setup_for_test_(false),
       waiting_for_change_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(test_weak_factory_(this)),
       profile_(sync_service->profile()),
       error_handler_(error_handler),
-      favicon_cache_(profile_, kMaxSyncFavicons) {
+      favicon_cache_(profile_,
+                     sync_service->current_experiments().favicon_sync_limit) {
   DCHECK(CalledOnValidThread());
   DCHECK(sync_service_);
   DCHECK(profile_);
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kSyncTabFavicons))
     favicon_cache_.SetLegacyDelegate(this);
 }
 
 SessionModelAssociator::SessionModelAssociator(ProfileSyncService* sync_service,
                                                bool setup_for_test)
@@ skipping 1041 matching lines @@
 
 bool SessionModelAssociator::CryptoReadyIfNecessary() {
   // We only access the cryptographer while holding a transaction.
   syncer::ReadTransaction trans(FROM_HERE, sync_service_->GetUserShare());
   const syncer::ModelTypeSet encrypted_types = trans.GetEncryptedTypes();
   return !encrypted_types.Has(SESSIONS) ||
          sync_service_->IsCryptographerReady(&trans);
 }
 
 }  // namespace browser_sync