[BlobAsync] Patch 2: Common Constants

storage/common/blob_storage/blob_storage_constants.h

+// Copyright 2015 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.
+
+#ifndef STORAGE_COMMON_BLOB_STORAGE_BLOB_STORAGE_CONSTANTS_H_
+#define STORAGE_COMMON_BLOB_STORAGE_BLOB_STORAGE_CONSTANTS_H_
+
+namespace storage {
+
+// TODO(michaeln): use base::SysInfo::AmountOfPhysicalMemoryMB() in some
+// way to come up with a better limit.
+const int64 kBlobStorageMaxMemoryUsage = 500 * 1024 * 1024;  // Half a gig.
+const size_t kBlobStorageIPCThresholdBytes = 250 * 1024;
+const size_t kBlobStorageMaxSharedMemoryBytes = 10 * 1024 * 1024;
+const uint64_t kBlobStorageMaxFileSizeBytes = 100 * 1024 * 1024;
+const uint64_t kBlobStorageMinFileSizeBytes = 1 * 1024 * 1024;
+const size_t kBlobStorageMaxBlobMemorySize =
+    kBlobStorageMaxMemoryUsage - kBlobStorageMinFileSizeBytes;
+
+enum class IPCBlobItemRequestStrategy {
+  UNKNOWN = 0,
+  IPC,
+  SHARED_MEMORY,
+  FILE,
+  LAST = FILE
+};
+
+enum class IPCBlobCreationCancelCode {
+  UNKNOWN = 0,
+  OUT_OF_MEMORY,
+  FILE_WRITE_FAILED,
+  LAST = FILE_WRITE_FAILED
+};
+
+}  // namespace storage
+
+#endif  // STORAGE_COMMON_BLOB_STORAGE_BLOB_STORAGE_CONSTANTS_H_