Introduce a ChromeDriver automation version constant and a JSON request

for the client to fetch the server's version. If the server's version is
newer than the client's, warn the client and quit.

Additional small changes:
-Add /healthz callback that sends a 200 status, for checking if the server is up.
-Fix shutdown crash where the AutomationProxy is deleted on the wrong thread.
-Initialize logging correctly.
-Disable mongoose file serving capabilities by default
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6690060

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80813 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 1 deletions

diff --git a/chrome/common/automation_constants.h b/chrome/common/automation_constants.h
index cddd589..ed7f2d2 100644
--- a/chrome/common/automation_constants.h
+++ b/chrome/common/automation_constants.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -50,6 +50,15 @@ enum MouseButton {
   kRightButton,
 };
 
+// The current version of ChromeDriver automation supported by Chrome.
+// This needs to be incremented for each change to ChromeDriver automation that
+// is not backwards compatible. Some examples of this would be:
+// - SendJSONRequest or Hello IPC messages change
+// - The interface for an individual ChromeDriver automation call changes in an
+//   incompatible way
+// TODO(kkania): Investigate a better backwards compatible automation solution.
+extern const int kChromeDriverAutomationVersion;
+
 }  // namespace automation
 
 // Used by AutomationProxy, declared here so that other headers don't need