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diff --git a/chrome/browser/extensions/extension_creator.h b/chrome/browser/extensions/extension_creator.h
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+++ b/chrome/browser/extensions/extension_creator.h
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+// Copyright (c) 2009 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_EXTENSION_CREATOR_H_
+#define CHROME_COMMON_EXTENSIONS_EXTENSION_CREATOR_H_
+
+#include "base/command_line.h"
+#include "base/crypto/rsa_private_key.h"
+#include "base/file_path.h"
+#include "base/values.h"
+
+// This class create an installable extension (.crx file) given an input
+// directory that contains a valid manifest.json and the extension's resources
+// contained within that directory. The output .crx file is always signed with a
+// private key that is either provided in |private_key_path| or is internal
+// generated randomly (and optionally written to |output_private_key_path|.
+class ExtensionCreator {
+ public:
+  ExtensionCreator() {}
+
+  bool Run(const FilePath& extension_dir,
+           const FilePath& crx_path,
+           const FilePath& private_key_path,
+           const FilePath& private_key_output_path);
+
+  // Returns the error message that will be present if Run(...) returned false.
+  std::string error_message() { return error_message_; }
+
+ private:
+  // Verifies input directory's existance, and reads manifest. |extension_dir|
+  // Is the source directory that should contain all the extension resources.
+  // |private_key_path| is the optional path to an existing private key to sign
+  // the extension. If not provided, a random key will be created (in which case
+  // it is written to |private_key_output_path| -- if provided).
+  DictionaryValue* InitializeInput(const FilePath& extension_dir,
+                                   const FilePath& private_key_path,
+                                   const FilePath& private_key_output_path);
+
+  // Reads private key from |private_key_path|.
+  base::RSAPrivateKey* ReadInputKey(const FilePath& private_key_path);
+
+  // Generates a key pair and writes the private key to |private_key_path|
+  // if provided.
+  base::RSAPrivateKey* GenerateKey(const FilePath& private_key_path);
+
+  // Creates temporary zip file and generates a signature for it.
+  bool CreateAndSignZip(const FilePath& extension_dir,
+                        base::RSAPrivateKey* key_pair,
+                        FilePath* zip_path,
+                        std::string* signature);
+
+  // Inserts generated keys (signature, public_key) into manifest.
+  bool PrepareManifestForExport(base::RSAPrivateKey* key_pair,
+                                const std::string& signature,
+                                DictionaryValue* manifest);
+
+  // Export installable .crx to |crx_path|.
+  bool WriteCRX(const FilePath& crx_path,
+                DictionaryValue *manifest,
+                const FilePath& zip_path);
+
+  // Holds a message for any error that is raised during Run(...).
+  std::string error_message_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionCreator);
+};
+
+#endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CREATOR_H_