[BackgroundSync] Handle storage failure

content/browser/cache_storage/cache_storage_scheduler.h

Index: content/browser/cache_storage/cache_storage_scheduler.h
diff --git a/content/browser/cache_storage/cache_storage_scheduler.h b/content/browser/cache_storage/cache_storage_scheduler.h
index 32e7617de00cd696f3a674eeebe8ee1038d6bcf4..dec6cbe72954b68847e90eb1c6d1ad44cffaaefe 100644
--- a/content/browser/cache_storage/cache_storage_scheduler.h
+++ b/content/browser/cache_storage/cache_storage_scheduler.h
@@ -12,6 +12,14 @@
 
 namespace content {
 
+// TODO(jkarlin): Support readers and writers so operations can run in parallel.
+// TODO(jkarlin): Support operation identification so that ops can be checked in
+// DCHECKs.
+
+// CacheStorageScheduler runs the scheduled callbacks sequentially. Add an
+// operation by calling ScheduleOperation() with your callback. Once your
+// operation is done be sure to call CompleteOperationAndRunNext() to schedule
+// the next operation.
 class CONTENT_EXPORT CacheStorageScheduler {
  public:
   CacheStorageScheduler();