Add a device policy for specifying the release channel.

chrome/browser/policy/device_policy_cache.cc

Index: chrome/browser/policy/device_policy_cache.cc
diff --git a/chrome/browser/policy/device_policy_cache.cc b/chrome/browser/policy/device_policy_cache.cc
index bb9f5339146baade3d10c68e1751dbd27db7f0dd..b1e57ef329df6b84e20a69755e6f6d413d5df38b 100644
--- a/chrome/browser/policy/device_policy_cache.cc
+++ b/chrome/browser/policy/device_policy_cache.cc
@@ -9,6 +9,8 @@
 #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"
@@ -299,6 +301,14 @@ void DevicePolicyCache::DecodeDevicePolicy(
                        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