Validate hash_sha256 checksum on .crx update.

extensions/common/switches.cc

 // Copyright 2013 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.
 
 #include "extensions/common/switches.h"
 
 namespace extensions {
 
 namespace switches {
 
@@ skipping 83 matching lines @@
 // Makes component extensions appear in chrome://settings/extensions.
 const char kShowComponentExtensionOptions[] =
     "show-component-extension-options";
 
 // Adds the given extension ID to all the permission whitelists.
 const char kWhitelistedExtensionID[] = "whitelisted-extension-id";
 
 // Pass launch source to platform apps.
 const char kTraceAppSource[] = "enable-trace-app-source";
 
+// Enable package hash check: the .crx file sha256 hash sum should be equal to
+// the one received from update manifest.
+const char kEnableCrxHashCheck[] = "enable-crx-hash-check";
+
 }  // namespace switches
 
 }  // namespace extensions