AU: Send board (e.g. x86-generic) to update server in query.

omaha_request_prep_action.cc

Index: omaha_request_prep_action.cc
diff --git a/omaha_request_prep_action.cc b/omaha_request_prep_action.cc
index 25772d03ae6493eb4c72bc7571c1deef9fe90bd4..7163119cb57634ef862f48051c66fe69542ad220 100644
--- a/omaha_request_prep_action.cc
+++ b/omaha_request_prep_action.cc
@@ -36,12 +36,14 @@ void OmahaRequestPrepAction::PerformAction() {
   const string track(GetLsbValue("CHROMEOS_RELEASE_TRACK", ""));
   const string update_url(GetLsbValue("CHROMEOS_AUSERVER",
                                       UpdateCheckParams::kUpdateUrl));
+  const string board(GetLsbValue("CHROMEOS_RELEASE_BOARD", ""));
 
   UpdateCheckParams out(machine_id,  // machine_id
                         machine_id,  // user_id (use machine_id)
                         UpdateCheckParams::kOsPlatform,
                         UpdateCheckParams::kOsVersion,
                         sp,  // e.g. 0.2.3.3_i686
+                        board,  // e.g. x86-generic
                         UpdateCheckParams::kAppId,
                         version,  // app version (from lsb-release)
                         "en-US",  // lang