AU: Beginnings of delta support

- proto file for delta files; still needs hardlink support

- code to generate a delta update from two directory trees (old, new).

- code to parse delta update

- Actions: postinst-runner, install, bootable flag setter, filesystem
 copier, Omaha response handler, Omaha request preparer,

- misc utility functions, like StringHasSuffix(), templatized Action
 classes to feed/collect an object from another action.

- FilesystemIterator: iterates a directory tree with optional
 exclusion path. Tolerates deleting of files during iteration.

- Subprocess class: support for synchronously or asynchronously
 running an external command. Doesn't pass any env variables.

- Integration test that strings many Actions together and tests using
 actual Omaha/Lorry. Currently only tests full updates.

- New simple HTTP server for unittest that supports fake flaky
 connections.

- Some refactoring.

Review URL: http://codereview.chromium.org/466036


git-svn-id: svn://chrome-svn/chromeos/trunk@334 06c00378-0e64-4dae-be16-12b19f9950a1
diff --git a/http_fetcher.h b/http_fetcher.h
index 6e26906..5cd6f08 100644
--- a/http_fetcher.h
+++ b/http_fetcher.h
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UPDATE_ENGINE_HTTP_FETCHER_H__
-#define UPDATE_ENGINE_HTTP_FETCHER_H__
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_HTTP_FETCHER_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_HTTP_FETCHER_H__
 
 #include <string>
+#include <vector>
 #include <glib.h>
 #include "base/basictypes.h"
 
@@ -22,7 +23,7 @@
 
 class HttpFetcher {
  public:
-  HttpFetcher() : delegate_(NULL) {}
+  HttpFetcher() : post_data_set_(false), delegate_(NULL) {}
   virtual ~HttpFetcher() {}
   void set_delegate(HttpFetcherDelegate* delegate) {
     delegate_ = delegate;
@@ -87,4 +88,4 @@
 
 }  // namespace chromeos_update_engine
 
-#endif  // UPDATE_ENGINE_HTTP_FETCHER_H__
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_HTTP_FETCHER_H__