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..6cb929bd9d875eedf912d5e133e4a1933a3fd974 100644
--- a/chrome/browser/component_updater/component_unpacker.h
+++ b/chrome/browser/component_updater/component_unpacker.h
@@ -91,7 +91,7 @@ class ComponentUnpacker : public base::RefCountedThreadSafe<ComponentUnpacker> {
   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
+  // |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,
@@ -104,8 +104,24 @@ class ComponentUnpacker : public base::RefCountedThreadSafe<ComponentUnpacker> {
   // package is a differential update. Calls |callback| with the result.
   void Unpack(const Callback& callback);
 
+  // Set the base directory where the unpack directory will be created.
+  // If this is not set, files will be unzipped to temporary dir.
+  void set_unpack_base_dir(const base::FilePath& path);
+
+  // Creates a ComponentUnpacker by loading CRX and related install information
+  // from |backup_path| that was previously saved by SaveInstallSource(). This
+  // is to retry failed component installation. |pk_hash| is the expected public
+  // key SHA256 hash.
+  static scoped_refptr<ComponentUnpacker> CreateFromBackup(
+      const base::FilePath& backup_path,
+      const std::vector<uint8>& pk_hash,
+      ComponentInstaller* installer,
+      scoped_refptr<base::SequencedTaskRunner> task_runner);
+
+
  private:
   friend class base::RefCountedThreadSafe<ComponentUnpacker>;
+  friend class ComponentUnpackerTest;
 
   virtual ~ComponentUnpacker();
 
@@ -138,6 +154,16 @@ 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_|, |pk_hash_| and
+  // |in_process_|, to |backup_path|. This is to re-create ComponentUnpacker for
+  // retrying failed component patching.
+  bool SaveInstallSource(const base::FilePath& backup_path) const;
+
+  // Creates the directory for unzip. |new_dir| will be the full path to the
+  // directory.
+  bool CreateUnpackDirectory(base::FilePath* new_dir);
+
+  base::FilePath unpack_base_dir_;
   std::vector<uint8> pk_hash_;
   base::FilePath path_;
   base::FilePath unpack_path_;