Take 2 at browser_sync::ExtensionsActivityMonitor....

chrome/browser/sync/engine/process_commit_response_command.cc

Index: chrome/browser/sync/engine/process_commit_response_command.cc
===================================================================
--- chrome/browser/sync/engine/process_commit_response_command.cc	(revision 30303)
+++ chrome/browser/sync/engine/process_commit_response_command.cc	(working copy)
@@ -52,11 +52,19 @@
   status.zero_consecutive_errors();
 }
 
-ProcessCommitResponseCommand::ProcessCommitResponseCommand() {}
+ProcessCommitResponseCommand::ProcessCommitResponseCommand(
+    ExtensionsActivityMonitor* monitor) : extensions_monitor_(monitor) {}
 ProcessCommitResponseCommand::~ProcessCommitResponseCommand() {}
 
 void ProcessCommitResponseCommand::ModelChangingExecuteImpl(
     SyncerSession* session) {
+  ProcessCommitResponse(session);
+  if (!session->HadSuccessfulCommits())
+    extensions_monitor_->PutRecords(session->extensions_activity());
+}
+
+void ProcessCommitResponseCommand::ProcessCommitResponse(
+    SyncerSession* session) {
   // TODO(sync): This function returns if it sees problems. We probably want
   // to flag the need for an update or similar.
   ScopedDirLookup dir(session->dirman(), session->account_name());