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diff --git a/chromium/extensions/browser/updater/manifest_fetch_data.h b/chromium/extensions/browser/updater/manifest_fetch_data.h
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+++ b/chromium/extensions/browser/updater/manifest_fetch_data.h
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+// Copyright 2014 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 EXTENSIONS_BROWSER_UPDATER_MANIFEST_FETCH_DATA_H_
+#define EXTENSIONS_BROWSER_UPDATER_MANIFEST_FETCH_DATA_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/macros.h"
+#include "url/gurl.h"
+
+namespace extensions {
+
+// To save on server resources we can request updates for multiple extensions
+// in one manifest check. This class helps us keep track of the id's for a
+// given fetch, building up the actual URL, and what if anything to include
+// in the ping parameter.
+class ManifestFetchData {
+ public:
+  static const int kNeverPinged = -1;
+
+  // What ping mode this fetch should use.
+  enum PingMode {
+    // No ping, no extra metrics.
+    NO_PING,
+
+    // Ping without extra metrics.
+    PING,
+
+    // Ping with information about enabled/disabled state.
+    PING_WITH_ENABLED_STATE,
+  };
+
+  // Each ping type is sent at most once per day.
+  enum PingType {
+    // Used for counting total installs of an extension/app/theme.
+    ROLLCALL,
+
+    // Used for counting number of active users of an app, where "active" means
+    // the app was launched at least once since the last active ping.
+    ACTIVE,
+  };
+
+  struct PingData {
+    // The number of days it's been since our last rollcall or active ping,
+    // respectively. These are calculated based on the start of day from the
+    // server's perspective.
+    int rollcall_days;
+    int active_days;
+
+    // Whether the extension is enabled or not.
+    bool is_enabled;
+
+    // A bitmask of Extension::DisableReason's, which may contain one or more
+    // reasons why an extension is disabled.
+    int disable_reasons;
+
+    PingData()
+        : rollcall_days(0),
+          active_days(0),
+          is_enabled(true),
+          disable_reasons(0) {}
+    PingData(int rollcall, int active, bool enabled, int reasons)
+        : rollcall_days(rollcall),
+          active_days(active),
+          is_enabled(enabled),
+          disable_reasons(reasons) {}
+  };
+
+  ManifestFetchData(const GURL& update_url,
+                    int request_id,
+                    const std::string& brand_code,
+                    const std::string& base_query_params,
+                    PingMode ping_mode);
+  ~ManifestFetchData();
+
+  // Returns true if this extension information was successfully added. If the
+  // return value is false it means the full_url would have become too long, and
+  // this ManifestFetchData object remains unchanged.
+  bool AddExtension(const std::string& id,
+                    const std::string& version,
+                    const PingData* ping_data,
+                    const std::string& update_url_data,
+                    const std::string& install_source);
+
+  const GURL& base_url() const { return base_url_; }
+  const GURL& full_url() const { return full_url_; }
+  const std::set<std::string>& extension_ids() const { return extension_ids_; }
+  const std::set<int>& request_ids() const { return request_ids_; }
+
+  // Returns true if the given id is included in this manifest fetch.
+  bool Includes(const std::string& extension_id) const;
+
+  // Returns true if a ping parameter for |type| was added to full_url for this
+  // extension id.
+  bool DidPing(const std::string& extension_id, PingType type) const;
+
+  // Assuming that both this ManifestFetchData and |other| have the same
+  // full_url, this method merges the other information associated with the
+  // fetch (in particular this adds all request ids associated with |other|
+  // to this ManifestFetchData).
+  void Merge(const ManifestFetchData& other);
+
+ private:
+  // The set of extension id's for this ManifestFetchData.
+  std::set<std::string> extension_ids_;
+
+  // The set of ping data we actually sent.
+  std::map<std::string, PingData> pings_;
+
+  // The base update url without any arguments added.
+  GURL base_url_;
+
+  // The base update url plus arguments indicating the id, version, etc.
+  // information about each extension.
+  GURL full_url_;
+
+  // The set of request ids associated with this manifest fetch. If multiple
+  // requests are trying to fetch the same manifest, they can be merged into
+  // one fetch, so potentially multiple request ids can get associated with
+  // one ManifestFetchData.
+  std::set<int> request_ids_;
+
+  // The brand code to include with manifest fetch queries, if non-empty and
+  // |ping_mode_| >= PING.
+  const std::string brand_code_;
+
+  // The ping mode for this fetch. This determines whether or not ping data
+  // (and possibly extra metrics) will be included in the fetch query.
+  const PingMode ping_mode_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManifestFetchData);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_UPDATER_MANIFEST_FETCH_DATA_H_