Factor Chrome details out of update manifest fetching.

extensions/browser/updater/manifest_fetch_data_delegate.h

+// 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_DELEGATE_H_
+#define EXTENSIONS_BROWSER_UPDATER_MANIFEST_FETCH_DATA_DELEGATE_H_
+
+#include <string>
+
+#include "extensions/browser/updater/manifest_fetch_data.h"
+
+namespace extensions {
+
+class ManifestFetchDataDelegate {
+ public:
+  ManifestFetchDataDelegate() {}
+  virtual ~ManifestFetchDataDelegate() {}
+
+  // Returns baseline query parameters to include with every update manifest
+  // fetch request.
+  virtual std::string GetBaseQueryParams() = 0;
+
+  // Indicates whether or not the Chrome Webstore update service should
+  // also be checked for updates when an item's update URL points elsewhere.
+  virtual bool ShouldAlwaysCheckWebstore() = 0;
+
+  // Returns a brand code to be submitted with manifest fetch requests. If
+  // this is an empty string, no brand code is submitted.
+  virtual std::string GetBrandCode() = 0;
+
+  // Returns a string of ping-related query parameters to be appended to a
+  // manifest fetch given an extension ID to be fetched and existing PingData.
+  virtual std::string GetPingParamsAndData(
+      const std::string& extension_id,
+      const ManifestFetchData::PingData& old_ping_data,
+      ManifestFetchData::PingData* new_ping_data) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_UPDATER_MANIFEST_FETCH_DATA_DELEGATE_H_