Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/fileapi/file_system_quota_client.cc

 // Copyright (c) 2012 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 "webkit/browser/fileapi/file_system_quota_client.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 179 matching lines @@
   base::PostTaskAndReplyWithResult(
       file_task_runner(),
       FROM_HERE,
       base::Bind(&DeleteOriginOnFileThread,
                  file_system_context_,
                  origin,
                  fs_type),
       callback);
 }
 
+bool FileSystemQuotaClient::DoesSupport(quota::StorageType storage_type) const {
+  FileSystemType type = QuotaStorageTypeToFileSystemType(storage_type);
+  DCHECK(type != kFileSystemTypeUnknown);
+  return file_system_context_->IsSandboxFileSystem(type);
+}
+
 base::SequencedTaskRunner* FileSystemQuotaClient::file_task_runner() const {
   return file_system_context_->default_file_task_runner();
 }
 
 }  // namespace fileapi