SyncFS: Fix when to call OnSyncIdle()

chrome/browser/sync_file_system/sync_process_runner.cc

Index: chrome/browser/sync_file_system/sync_process_runner.cc
diff --git a/chrome/browser/sync_file_system/sync_process_runner.cc b/chrome/browser/sync_file_system/sync_process_runner.cc
index e746ec588e0d0d90dad9a967026bbd5740dd8e13..2f42d790d64254291a70ee8a7fb4d2a271a662c1 100644
--- a/chrome/browser/sync_file_system/sync_process_runner.cc
+++ b/chrome/browser/sync_file_system/sync_process_runner.cc
@@ -93,14 +93,15 @@ void SyncProcessRunner::ScheduleIfNotRunning() {
 void SyncProcessRunner::OnChangesUpdated(
     int64 pending_changes) {
   DCHECK_GE(pending_changes, 0);
-  if (pending_changes_ != pending_changes) {
+  int64 old_pending_changes = pending_changes_;
+  pending_changes_ = pending_changes;
+  if (old_pending_changes != pending_changes) {
     if (pending_changes == 0)
       sync_service()->OnSyncIdle();
     util::Log(logging::LOG_VERBOSE, FROM_HERE,
               "[%s] pending_changes updated: %" PRId64,
               name_.c_str(), pending_changes);
   }
-  pending_changes_ = pending_changes;
   Schedule();
 }