[BlobAsync] Disk support for blob storage

storage/common/blob_storage/blob_storage_constants.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "storage/common/blob_storage/blob_storage_constants.h"
+
+#include "base/logging.h"
+
+namespace storage {
+
+bool BlobStatusIsError(BlobStatus status) {
+  return static_cast<int>(status) <= static_cast<int>(BlobStatus::LAST_ERROR);
+}
+
+bool BlobStatusIsBadIPC(BlobStatus status) {
+  return status == BlobStatus::ERR_INVALID_CONSTRUCTION_ARGUMENTS;
+}
+
+bool BlobStatusIsPending(BlobStatus status) {
+  switch (status) {
+    case BlobStatus::ERR_INVALID_CONSTRUCTION_ARGUMENTS:
+    case BlobStatus::ERR_OUT_OF_MEMORY:
+    case BlobStatus::ERR_FILE_WRITE_FAILED:
+    case BlobStatus::ERR_SOURCE_DIED_IN_TRANSIT:
+    case BlobStatus::ERR_BLOB_DEREFERENCED_WHILE_BUILDING:
+    case BlobStatus::ERR_REFERENCED_BLOB_BROKEN:
+    case BlobStatus::DONE:
+      return false;
+    case BlobStatus::PENDING_MEMORY_REQUEST:
+    case BlobStatus::PENDING_MEMORY_QUOTA:
+    case BlobStatus::PENDING_DATA_POPULATION:
+      return true;
+  }
+  NOTREACHED();
+  return false;
+}
+
+}  // namespace storage