Send important client side event information to the server.

chrome/browser/sync/engine/download_updates_command.h

Index: chrome/browser/sync/engine/download_updates_command.h
diff --git a/chrome/browser/sync/engine/download_updates_command.h b/chrome/browser/sync/engine/download_updates_command.h
index 713f03b3d337f2988dee84d045e501e8b85ac743..36dce4f28aa0cae8cb846f20d628c65a34aa01cd 100644
--- a/chrome/browser/sync/engine/download_updates_command.h
+++ b/chrome/browser/sync/engine/download_updates_command.h
@@ -7,8 +7,10 @@
 #pragma once
 
 #include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
 #include "chrome/browser/sync/engine/model_safe_worker.h"
 #include "chrome/browser/sync/engine/syncer_command.h"
+#include "chrome/browser/sync/protocol/sync.pb.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 namespace sync_pb {
@@ -47,6 +49,9 @@ class DownloadUpdatesCommand : public SyncerCommand {
                          sync_pb::EntitySpecifics* filter_protobuf);
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(DownloadUpdatesCommandTest, VerifyAppendDebugInfo);
+  void AppendClientDebugInfoIfNeeded(sessions::SyncSession* session,
+      sync_pb::ClientToServerMessage* client_to_server_message);
   DISALLOW_COPY_AND_ASSIGN(DownloadUpdatesCommand);
 };