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diff --git a/chrome/common/extensions/update_manifest.h b/chrome/common/extensions/update_manifest.h
new file mode 100644
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+++ b/chrome/common/extensions/update_manifest.h
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+// Copyright (c) 2010 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_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_
+#define CHROME_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "googleurl/src/gurl.h"
+
+class UpdateManifest {
+ public:
+
+  // An update manifest looks like this:
+  //
+  // <?xml version='1.0' encoding='UTF-8'?>
+  // <gupdate xmlns='http://www.google.com/update2/response' protocol='2.0'>
+  //  <daystart elapsed_seconds='300' />
+  //  <app appid='12345'>
+  //   <updatecheck codebase='http://example.com/extension_1.2.3.4.crx'
+  //                version='1.2.3.4' prodversionmin='2.0.143.0'
+  //                hash="12345"/>
+  //  </app>
+  // </gupdate>
+  //
+  // The <daystart> tag contains a "elapsed_seconds" attribute which refers to
+  // the server's notion of how many seconds it has been since midnight.
+  //
+  // The "appid" attribute of the <app> tag refers to the unique id of the
+  // extension. The "codebase" attribute of the <updatecheck> tag is the url to
+  // fetch the updated crx file, and the "prodversionmin" attribute refers to
+  // the minimum version of the chrome browser that the update applies to.
+
+  // The result of parsing one <app> tag in an xml update check manifest.
+  struct Result {
+    std::string extension_id;
+    std::string version;
+    std::string browser_min_version;
+    std::string package_hash;
+    GURL crx_url;
+  };
+
+  static const int kNoDaystart = -1;
+  struct Results {
+    std::vector<Result> list;
+    // This will be >= 0, or kNoDaystart if the <daystart> tag was not present.
+    int daystart_elapsed_seconds;
+  };
+
+  UpdateManifest();
+  ~UpdateManifest();
+
+  // Parses an update manifest xml string into Result data. Returns a bool
+  // indicating success or failure. On success, the results are available by
+  // calling results(). The details for any failures are available by calling
+  // errors().
+  bool Parse(const std::string& manifest_xml);
+
+  const Results& results() { return results_; }
+  const std::string& errors() { return errors_; }
+
+ private:
+  Results results_;
+  std::string errors_;
+
+  // Helper function that adds parse error details to our errors_ string.
+  void ParseError(const char* details, ...);
+
+  DISALLOW_COPY_AND_ASSIGN(UpdateManifest);
+};
+
+#endif  // CHROME_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_