[CacheStorage] Add metrics to the scheduler

content/browser/background_sync/background_sync_manager.cc

 // Copyright 2015 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 "content/browser/background_sync/background_sync_manager.h"
 
 #include <utility>
 
 #include "base/barrier_closure.h"
 #include "base/bind.h"
@@ skipping 257 matching lines @@
   DispatchSyncEvent(
       tag, std::move(active_version),
       last_chance
           ? blink::mojom::BackgroundSyncEventLastChance::IS_LAST_CHANCE
           : blink::mojom::BackgroundSyncEventLastChance::IS_NOT_LAST_CHANCE,
       callback);
 }
 
 BackgroundSyncManager::BackgroundSyncManager(
     scoped_refptr<ServiceWorkerContextWrapper> service_worker_context)
-    : service_worker_context_(service_worker_context),
+    : op_scheduler_(CacheStorageSchedulerClient::CLIENT_BACKGROUND_SYNC),
+      service_worker_context_(service_worker_context),
       parameters_(new BackgroundSyncParameters()),
       disabled_(false),
       num_firing_registrations_(0),
       clock_(new base::DefaultClock()),
       weak_ptr_factory_(this) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   service_worker_context_->AddObserver(this);
 
 #if defined(OS_ANDROID)
@@ skipping 898 matching lines @@
   parameters_->max_sync_attempts = max_attempts;
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, callback);
 }
 
 base::Closure BackgroundSyncManager::MakeEmptyCompletion() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   return op_scheduler_.WrapCallbackToRunNext(base::Bind(&base::DoNothing));
 }
 
 }  // namespace content