[BlobStorage] Enabling disk paging and direct 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 {
 
+static_assert(kDefaultIPCMemorySize < kDefaultSharedMemorySize,
+              "IPC transport size must be smaller than shared memory size.");
+static_assert(kDefaultMinPageFileSize < kDefaultMaxPageFileSize,
+              "Min page file size must be less than max.");
+static_assert(kDefaultMinPageFileSize < kDefaultMaxBlobInMemorySpace,
+              "Page file size must be less than in-memory space.");
+
+bool BlobStorageLimits::IsValid() const {
+  return max_ipc_memory_size < max_shared_memory_size &&
+         min_page_file_size < max_file_size &&
+         min_page_file_size < max_blob_in_memory_space;
+}
+
 bool BlobStatusIsError(BlobStatus status) {
   return static_cast<int>(status) <= static_cast<int>(BlobStatus::LAST_ERROR);
 }
 
 bool BlobStatusIsPending(BlobStatus status) {
   int status_int = static_cast<int>(status);
   return status_int >= static_cast<int>(BlobStatus::PENDING_QUOTA) &&
          status_int <= static_cast<int>(BlobStatus::PENDING_INTERNALS);
 }
 
 bool BlobStatusIsBadIPC(BlobStatus status) {
   return status == BlobStatus::ERR_INVALID_CONSTRUCTION_ARGUMENTS;
 }
 
 }  // namespace storage