PinManager: Only handle events when in the right stages

Bug: b:269038633
Test: chromeos_unittests --gtest_filter=DriveFsPinManagerTest.*
Change-Id: I09999d8030a3efa223027891da8d45443c96b8f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4243038
Reviewed-by: Marcello Salomao <msalomao@google.com>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1104357}

chromeos/ash/components/drivefs/drivefs_pin_manager.cc

@@ -776,6 +776,12 @@ void PinManager::OnSyncingStatusUpdate(const mojom::SyncingStatus& status) {
 
   for (const mojom::ItemEventPtr& event : status.item_events) {
     DCHECK(event);
+
+    if (!InProgress(progress_.stage)) {
+      VLOG(2) << "Ignored " << Quote(*event);
+      continue;
+    }
+
     if (OnSyncingEvent(*event)) {
       progress_.useful_events++;
     } else {
@@ -881,6 +887,12 @@ void PinManager::OnFilesChanged(const std::vector<mojom::FileChange>& changes) {
 void PinManager::OnFileCreated(const mojom::FileChange& event) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
+  if (!InProgress(progress_.stage)) {
+    VLOG(2) << "Ignored " << Quote(event) << ": PinManager is currently "
+            << progress_.stage;
+    return;
+  }
+
   const Id id = Id(event.stable_id);
   const Path& path = event.path;