Elevated install of recovery component (component update part)

chrome/browser/component_updater/component_unpacker.h

Index: chrome/browser/component_updater/component_unpacker.h
diff --git a/chrome/browser/component_updater/component_unpacker.h b/chrome/browser/component_updater/component_unpacker.h
index ffd69dd9c4adf21c1fa16a385dfdeb3c5d19207f..f65de77343cc0fccbd88244273ef0da9d40c242a 100644
--- a/chrome/browser/component_updater/component_unpacker.h
+++ b/chrome/browser/component_updater/component_unpacker.h
@@ -104,8 +104,17 @@ class ComponentUnpacker : public base::RefCountedThreadSafe<ComponentUnpacker> {
   // package is a differential update. Calls |callback| with the result.
   void Unpack(const Callback& callback);
 
+  // Creates a ComponentUnpacker by loading CRX and related information from
+  // |backup_path| that was previously saved by SaveInstallSource().
+  static scoped_refptr<ComponentUnpacker> CreateFromBackup(
+      const base::FilePath& backup_path,
+      ComponentInstaller* installer,
+      scoped_refptr<base::SequencedTaskRunner> task_runner);
+
+
  private:
   friend class base::RefCountedThreadSafe<ComponentUnpacker>;
+  friend class ComponentUnpackerTest;
 
   virtual ~ComponentUnpacker();
 
@@ -138,6 +147,11 @@ class ComponentUnpacker : public base::RefCountedThreadSafe<ComponentUnpacker> {
   // Finish is responsible for calling the callback provided in Start().
   void Finish();
 
+  // Saves the original CRX file, along with fingerprint and other related
+  // infromation, to |backup_path|. This is for retry patching later when it
+  // fails.
+  bool SaveInstallSource(const base::FilePath& backup_path) const;
+
   std::vector<uint8> pk_hash_;
   base::FilePath path_;
   base::FilePath unpack_path_;