Use UtilityProcessHost to patch files.

chrome/common/chrome_utility_messages.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.
 
 // Multiply-included message file, so no include guard.
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 124 matching lines @@
 IPC_STRUCT_TRAITS_BEGIN(picasa::FolderINIContents)
   IPC_STRUCT_TRAITS_MEMBER(folder_path)
   IPC_STRUCT_TRAITS_MEMBER(ini_contents)
 IPC_STRUCT_TRAITS_END()
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
 //------------------------------------------------------------------------------
 // Utility process messages:
 // These are messages from the browser to the utility process.
 
-// Tell the utility process to unpack the given extension file in its
+// Tells the utility process to unpack the given extension file in its
 // directory and verify that it is valid.
 IPC_MESSAGE_CONTROL4(ChromeUtilityMsg_UnpackExtension,
                      base::FilePath /* extension_filename */,
                      std::string /* extension_id */,
                      int /* Manifest::Location */,
                      int /* InitFromValue flags */)
 
 // Tell the utility process to parse the given JSON data and verify its
 // validity.
 IPC_MESSAGE_CONTROL1(ChromeUtilityMsg_UnpackWebResource,
@@ skipping 42 matching lines @@
 IPC_MESSAGE_CONTROL1(ChromeUtilityMsg_GetPrinterCapsAndDefaults,
                      std::string /* printer name */)
 
 // Tells the utility process to get capabilities and defaults for the specified
 // printer. Used on Windows to isolate the service process from printer driver
 // crashes by executing this in a separate process. This does not run in a
 // sandbox. Returns result as printing::PrinterSemanticCapsAndDefaults.
 IPC_MESSAGE_CONTROL1(ChromeUtilityMsg_GetPrinterSemanticCapsAndDefaults,
                      std::string /* printer name */)
 
+// Tell the utility process to patch the given |input_file| using |patch_file|
+// and place the output in |output_file|. The patch should use the bsdiff
+// algorithm (Courgette's version).
+IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_PatchFileBsdiff,
+                     base::FilePath /* input_file */,
+                     base::FilePath /* patch_file */,
+                     base::FilePath /* output_file */)
+
+// Tell the utility process to patch the given |input_file| using |patch_file|
+// and place the output in |output_file|. The patch should use the Courgette
+// algorithm.
+IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_PatchFileCourgette,
+                     base::FilePath /* input_file */,
+                     base::FilePath /* patch_file */,
+                     base::FilePath /* output_file */)
+
 #if defined(OS_CHROMEOS)
 // Tell the utility process to create a zip file on the given list of files.
 IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_CreateZipFile,
                      base::FilePath /* src_dir */,
                      std::vector<base::FilePath> /* src_relative_paths */,
                      base::FileDescriptor /* dest_fd */)
 #endif  // defined(OS_CHROMEOS)
 
 // Requests the utility process to respond with a
 // ChromeUtilityHostMsg_ProcessStarted message once it has started.  This may
@@ skipping 137 matching lines @@
                      printing::PrinterCapsAndDefaults)
 
 // Reply when the utility process has succeeded in obtaining the printer
 // semantic capabilities and defaults.
 IPC_MESSAGE_CONTROL2(
     ChromeUtilityHostMsg_GetPrinterSemanticCapsAndDefaults_Succeeded,
     std::string /* printer name */,
     printing::PrinterSemanticCapsAndDefaults)
 #endif
 
+// Reply when a file has been patched successfully.
+IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_PatchFile_Succeeded)
+
+// Reply when patching a file failed.
+IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_PatchFile_Failed,
+                     int /* error code */)
+
 // Reply when the utility process has failed to obtain the printer
 // capabilities and defaults.
 IPC_MESSAGE_CONTROL1(ChromeUtilityHostMsg_GetPrinterCapsAndDefaults_Failed,
                      std::string /* printer name */)
 
 // Reply when the utility process has failed to obtain the printer
 // semantic capabilities and defaults.
 IPC_MESSAGE_CONTROL1(
   ChromeUtilityHostMsg_GetPrinterSemanticCapsAndDefaults_Failed,
   std::string /* printer name */)
@@ skipping 57 matching lines @@
 
 IPC_MESSAGE_CONTROL2(ChromeUtilityHostMsg_ParseMediaMetadata_Finished,
                      bool /* parse_success */,
                      base::DictionaryValue /* metadata */)
 
 IPC_MESSAGE_CONTROL3(ChromeUtilityHostMsg_RequestBlobBytes,
                      int64 /* request_id */,
                      int64 /* start_byte */,
                      int64 /* length */)
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)