Implement the Request/Response bits of Background Fetch

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchFailEvent.cpp

 // Copyright 2017 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 "modules/background_fetch/BackgroundFetchFailEvent.h"
 
 #include "modules/EventModulesNames.h"
 #include "modules/background_fetch/BackgroundFetchFailEventInit.h"
+#include "modules/background_fetch/BackgroundFetchSettledRequest.h"
 
 namespace blink {
 
 BackgroundFetchFailEvent::BackgroundFetchFailEvent(
     const AtomicString& type,
     const BackgroundFetchFailEventInit& init)
-    : BackgroundFetchEvent(type, init) {}
+    : BackgroundFetchEvent(type, init), m_failedFetches(init.failedFetches()) {}
 
 BackgroundFetchFailEvent::~BackgroundFetchFailEvent() = default;
 
+HeapVector<Member<BackgroundFetchSettledRequest>>
+BackgroundFetchFailEvent::failedFetches() const {
+  return m_failedFetches;
+}
+
 const AtomicString& BackgroundFetchFailEvent::interfaceName() const {
   return EventNames::BackgroundFetchFailEvent;
 }
 
+DEFINE_TRACE(BackgroundFetchFailEvent) {
+  visitor->trace(m_failedFetches);
+  BackgroundFetchEvent::trace(visitor);
+}
+
 }  // namespace blink