[Blob] Blob paging to disk patch.

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;
+const uint64_t kBlobStorageInFlightMemory = kBlobStorageMinFileSizeBytes;
+const uint64_t kBlobStorageMaxDiskSpace = 5 * 1024 * 1024;  // 5 gigs.
 
 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_