Add a device policy for specifying the release channel.

chrome/browser/policy/device_policy_cache.cc

 // 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.
 
 #include "chrome/browser/policy/device_policy_cache.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/task.h"
 #include "base/values.h"
+#include "chrome/browser/chromeos/cros/cros_library.h"
+#include "chrome/browser/chromeos/cros/update_library.h"
 #include "chrome/browser/chromeos/cros_settings_names.h"
 #include "chrome/browser/chromeos/login/ownership_service.h"
 #include "chrome/browser/chromeos/login/signed_settings_helper.h"
 #include "chrome/browser/chromeos/user_cros_settings_provider.h"
 #include "chrome/browser/policy/configuration_policy_pref_store.h"
 #include "chrome/browser/policy/device_policy_identity_strategy.h"
 #include "chrome/browser/policy/enterprise_install_attributes.h"
 #include "chrome/browser/policy/policy_map.h"
 #include "chrome/browser/policy/proto/device_management_backend.pb.h"
 #include "chrome/browser/policy/proto/device_management_constants.h"
@@ skipping 270 matching lines @@
     }
     if (container.has_proxy_pac_url()) {
       recommended->Set(kPolicyProxyPacUrl,
                        Value::CreateStringValue(container.proxy_pac_url()));
     }
     if (container.has_proxy_bypass_list()) {
       recommended->Set(kPolicyProxyBypassList,
                        Value::CreateStringValue(container.proxy_bypass_list()));
     }
   }
+
+  if (policy.has_release_channel() &&
+      policy.release_channel().has_release_channel()) {
+    std::string channel = policy.release_channel().release_channel();
+    mandatory->Set(
+        kPolicyChromeOsReleaseChannel, Value::CreateStringValue(channel));

[gfeher, 2011/06/30 12:49:28]

FYI: this action will trigger NOTIMPLEMENTED() at the following place:
http://codesearch.google.com/codesearch#OAMlx_jo-ck/src/chrome/browser/policy...

unless you set the policy-to-preference mapping up. I am okay with deferring
that to a further CL, though.

[Patrick Dubroy, 2011/06/30 14:28:39]

Ok, I'll do that in a follow up CL.

+    chromeos::CrosLibrary::Get()->GetUpdateLibrary()->SetReleaseTrack(channel);
+  }
 }
 
 }  // namespace policy