Use UtilityProcessHost to patch files.

chrome/utility/chrome_content_utility_client.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_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_
 #define CHROME_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 74 matching lines @@
       double* scale_factor);
 #endif   // defined(OS_WIN)
 
   bool RenderPDFPagesToPWGRaster(
       base::PlatformFile pdf_file,
       const printing::PdfRenderSettings& settings,
       base::PlatformFile bitmap_file);
 
   void OnGetPrinterCapsAndDefaults(const std::string& printer_name);
   void OnGetPrinterSemanticCapsAndDefaults(const std::string& printer_name);
+  void OnPatchFileBsdiff(const base::FilePath& input_file,
+                         const base::FilePath& patch_file,
+                         const base::FilePath& output_file);
+  void OnPatchFileCourgette(const base::FilePath& input_file,
+                            const base::FilePath& patch_file,
+                            const base::FilePath& output_file);
   void OnStartupPing();
   void OnAnalyzeZipFileForDownloadProtection(
       const IPC::PlatformFileForTransit& zip_file);
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
   void OnCheckMediaFile(int64 milliseconds_of_decoding,
                         const IPC::PlatformFileForTransit& media_file);
   void OnParseMediaMetadata(const std::string& mime_type, int64 total_size);
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 #if defined(OS_WIN)
@@ skipping 28 matching lines @@
   bool filter_messages_;
   // A list of message_ids to filter.
   std::set<int> message_id_whitelist_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentUtilityClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_