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

[Dmitry Titov, 2017/06/14 19:56:37]

It's strange to have the flag check in offline_pages code itself. It should be
checked in the code that invokes ResourceTrackerObserverFromWebContents().

[Pete Williamson, 2017/06/15 01:03:27]

Removed.

+  OfflinerUserData* data = OfflinerUserData::FromWebContents(webcontents);
+  if (data)
+    return static_cast<ResourceTrackerObserver*>(
+        static_cast<offline_pages::BackgroundLoaderOffliner*>(
+            data->offliner()));
+#endif
+
+  return nullptr;
+}
+
+}  // namespace offline_pages
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(offline_pages::OfflinerUserData);