Differential updates for components.

chrome/installer/setup/setup_util.h

Index: chrome/installer/setup/setup_util.h
===================================================================
--- chrome/installer/setup/setup_util.h	(revision 201835)
+++ chrome/installer/setup/setup_util.h	(working copy)
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// This file declares util functions for setup project.
+// This file declares util functions for setup project. It also declares a
+// few functions that the Chrome component updater uses for patching binary
+// deltas.
 
 #ifndef CHROME_INSTALLER_SETUP_SETUP_UTIL_H_
 #define CHROME_INSTALLER_SETUP_SETUP_UTIL_H_
@@ -28,15 +30,27 @@
 class InstallerState;
 class ProductState;
 
-// Apply a diff patch to source file. First tries to apply it using courgette
-// since it checks for courgette header and fails quickly. If that fails
-// tries to apply the patch using regular bsdiff. Returns status code.
+// Apply a diff patch to source file. First tries to apply it using Courgette
+// since it checks for Courgette header and fails quickly. If that fails
+// tries to apply the patch using regular bsdiff. Returns status code as
+// defined by the bsdiff code (see mbspatch.h for the definitions of the codes).
 // The installer stage is updated if |installer_state| is non-NULL.
 int ApplyDiffPatch(const base::FilePath& src,
                    const base::FilePath& patch,
                    const base::FilePath& dest,
                    const InstallerState* installer_state);
 
+// Applies a patch file to source file using Courgette.
+int CourgettePatchFiles(const base::FilePath& src,
+                        const base::FilePath& patch,
+                        const base::FilePath& dest);
+
+// Applies a patch file to source file using bsdiff. This function uses
+// Courgette's flavor of bsdiff.
+int BsdiffPatchFiles(const base::FilePath& src,
+                     const base::FilePath& patch,
+                     const base::FilePath& dest);
+
 // Find the version of Chrome from an install source directory.
 // Chrome_path should contain at least one version folder.
 // Returns the maximum version found or NULL if no version is found.