Headers for resource tracking.

chrome/browser/offline_pages/offliner_user_data.cc

+// 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 "chrome/browser/offline_pages/offliner_user_data.h"
+
+class ResourceTrackerObserver;
+
+namespace offline_pages {
+
+void OfflinerUserData::AddToWebContents(content::WebContents* webcontents,
+                                        BackgroundLoaderOffliner* offliner) {
+  DCHECK(offliner);
+  webcontents->SetUserData(UserDataKey(), std::unique_ptr<OfflinerUserData>(
+                                              new OfflinerUserData(offliner)));
+}
+
+// static - gets the data pointer as a BackgroundLoaderOffliner
+BackgroundLoaderOffliner* OfflinerUserData::OfflinerFromWebContents(
+    content::WebContents* webcontents) {
+  OfflinerUserData* data = OfflinerUserData::FromWebContents(webcontents);
+  if (data)
+    return data->offliner();
+
+  return nullptr;
+}
+
+// static - gets the data pointer as a ResourceLoadingObserver
+ResourceLoadingObserver*
+OfflinerUserData::ResourceLoadingObserverFromWebContents(
+    content::WebContents* webcontents) {
+  OfflinerUserData* data = OfflinerUserData::FromWebContents(webcontents);
+  if (data)
+    return data->offliner();
+
+  return nullptr;
+}
+
+}  // namespace offline_pages
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(offline_pages::OfflinerUserData);