Use UtilityProcessHost to patch files.

chrome/browser/component_updater/component_unpacker.h

 // Copyright (c) 2012 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_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner.h"
 
 namespace component_updater {
 
 class ComponentInstaller;
 class ComponentPatcher;
 
 // Deserializes the CRX manifest. The top level must be a dictionary.
 scoped_ptr<base::DictionaryValue> ReadManifest(
     const base::FilePath& unpack_path);
@@ skipping 29 matching lines @@
 //     \_ Unzip
 //     \_ BeginPatching
 //          |
 //          V
 //   EndPatching
 //     \_ Install
 //     \_ Finish
 //
 // In both cases, if there is an error at any point, the remaining steps will
 // be skipped and Finish will be called.
-class ComponentUnpacker {
+class ComponentUnpacker : public base::RefCountedThreadSafe<ComponentUnpacker> {
  public:
   // Possible error conditions.
   // Add only to the bottom of this enum; the order must be kept stable.
   enum Error {
     kNone,
     kInvalidParams,
     kInvalidFile,
     kUnzipPathError,
     kUnzipFailed,
     kNoManifest,
     kBadManifest,
     kBadExtension,
     kInvalidId,
     kInstallerError,
     kIoError,
     kDeltaVerificationFailure,
     kDeltaBadCommands,
     kDeltaUnsupportedCommand,
     kDeltaOperationFailure,
     kDeltaPatchProcessFailure,
     kDeltaMissingExistingFile,
     kFingerprintWriteFailed,
   };
 
+  typedef base::Callback<void(Error, int)> Callback;
+
   // Constructs an unpacker for a specific component unpacking operation.
   // |pk_hash| is the expected/ public key SHA256 hash. |path| is the current
   // location of the CRX.
   ComponentUnpacker(const std::vector<uint8>& pk_hash,
                     const base::FilePath& path,
                     const std::string& fingerprint,
-                    ComponentPatcher* patcher,
                     ComponentInstaller* installer,
+                    bool in_process,
                     scoped_refptr<base::SequencedTaskRunner> task_runner);
 
+  // Begins the actual unpacking of the files. May invoke a patcher if the
+  // package is a differential update. Calls |callback| with the result.
+  void Unpack(const Callback& callback);
+
+ private:
+  friend class base::RefCountedThreadSafe<ComponentUnpacker>;
+
   virtual ~ComponentUnpacker();
 
-  // Begins the actual unpacking of the files. May invoke a patcher if the
-  // package is a differential update. Calls |callback| with the result.
-  void Unpack(
-      const base::Callback<void(Error, int)>& callback);
-
- private:
   bool UnpackInternal();
 
   // The first step of unpacking is to verify the file. Returns false if an
   // error is encountered, the file is malformed, or the file is incorrectly
   // signed.
   bool Verify();
 
   // The second step of unpacking is to unzip. Returns false if an error
   // occurs as part of unzipping.
   bool Unzip();
 
   // The third step is to optionally patch files - this is a no-op for full
   // (non-differential) updates. This step is asynchronous. Returns false if an
   // error is encountered.
   bool BeginPatching();
 
   // When patching is complete, EndPatching is called before moving on to step
   // four.
   void EndPatching(Error error, int extended_error);
 
   // The fourth step is to install the unpacked component.
   void Install();
 
   // The final step is to do clean-up for things that can't be tidied as we go.
   // If there is an error at any step, the remaining steps are skipped and
   // and Finish is called.
   // Finish is responsible for calling the callback provided in Start().
   void Finish();
 
-  // Returns a weak pointer to this object.
-  base::WeakPtr<ComponentUnpacker> GetWeakPtr();
-
   std::vector<uint8> pk_hash_;
   base::FilePath path_;
   base::FilePath unpack_path_;
   base::FilePath unpack_diff_path_;
   bool is_delta_;
   std::string fingerprint_;
-  ComponentPatcher* patcher_;
+  scoped_refptr<ComponentPatcher> patcher_;
   ComponentInstaller* installer_;
-  base::Callback<void(Error, int)> callback_;
+  Callback callback_;
+  const bool in_process_;
   Error error_;
   int extended_error_;
-  base::WeakPtrFactory<ComponentUnpacker> ptr_factory_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentUnpacker);
 };
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_