Include tab IDs when reporting data use accounting.

chrome/browser/data_usage/tab_id_annotator.h

+// 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.
+
+#ifndef CHROME_BROWSER_DATA_USAGE_TAB_ID_ANNOTATOR_H_
+#define CHROME_BROWSER_DATA_USAGE_TAB_ID_ANNOTATOR_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "components/data_usage/core/data_use_annotator.h"
+
+namespace data_usage {
+struct DataUse;
+}
+
+namespace net {
+class URLRequest;
+}
+
+namespace chrome_browser_data_usage {
+
+// Class that annotates DataUse objects with their associated tab IDs.
+class TabIdAnnotator : public data_usage::DataUseAnnotator {
+ public:
+  TabIdAnnotator();
+  ~TabIdAnnotator() override;
+
+  // Determines the tab ID associated with |request| if there is one, setting
+  // the tab ID on |data_use| appropriately and passing it to |callback| once
+  // the tab ID is ready. A tab ID of -1 is used if no tab ID is found for
+  // |request|. This method will attach a new TabIdProvider to |request| as user
+  // data if there isn't one attached already and |request| has enough
+  // information to get a tab ID.
+  void Annotate(net::URLRequest* request,
+                scoped_ptr<data_usage::DataUse> data_use,
+                const DataUseConsumerCallback& callback) override;
+
+ private:
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabIdAnnotator);
+};
+
+}  // namespace chrome_browser_data_usage
+
+#endif  // CHROME_BROWSER_DATA_USAGE_TAB_ID_ANNOTATOR_H_