Add skeletons for the factories to create the request coordinator and

components/offline_pages/background/prerenderer_offliner_factory.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.

[fgorski, 2016/04/29 04:16:46]

again this should be in c/b/a/op/

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/offline_pages/background/prerenderer_offliner_factory.h"
+
+#include "components/offline_pages/background/prerenderer_offliner.h"
+
+namespace offline_pages {
+
+class OfflinerPolicy;
+
+PrerendererOfflinerFactory::PrerendererOfflinerFactory() {
+  offliner_ = nullptr;
+}
+
+PrerendererOfflinerFactory::~PrerendererOfflinerFactory() {
+  delete offliner_;
+}
+
+// static
+PrerendererOffliner* PrerendererOfflinerFactory::GetInstance(
+    OfflinerPolicy* policy) {
+  // TODO(petewil): Think about whether there might be any threading
+  // issues.  This should always happen on the same thread, but make sure.
+  if (offliner_ == nullptr) {
+    offliner_ = new PrerendererOffliner(policy);
+  }
+    return offliner_;
+}
+
+}  // namespace offline_pages