[FileAPI] Replace default leveldb::Env with leveldb::MemEnv in tests.

webkit/browser/fileapi/file_system_options.h

 // 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.
 
 #ifndef WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPTIONS_H_
 #define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPTIONS_H_
 
 #include <string>
 #include <vector>
 
 #include "webkit/browser/webkit_storage_browser_export.h"
 
+namespace leveldb {
+class Env;
+}
+
 namespace fileapi {
 
 // Provides runtime options that may change FileSystem API behavior.
 // This object is copyable.
 class WEBKIT_STORAGE_BROWSER_EXPORT FileSystemOptions {
  public:
   enum ProfileMode {
     PROFILE_MODE_NORMAL = 0,
     PROFILE_MODE_INCOGNITO
   };
 
   // |profile_mode| specifies if the profile (for this filesystem)
   // is running in incognito mode (PROFILE_MODE_INCOGNITO) or no
   // (PROFILE_MODE_NORMAL).
   // |additional_allowed_schemes| specifies schemes that are allowed
   // to access FileSystem API in addition to "http" and "https".
+  // Non-NULL |env_override| overrides internal LevelDB environment.
   FileSystemOptions(
       ProfileMode profile_mode,
-      const std::vector<std::string>& additional_allowed_schemes);
+      const std::vector<std::string>& additional_allowed_schemes,
+      leveldb::Env* env_override);
 
   ~FileSystemOptions();
 
   // Returns true if it is running in the incognito mode.
   bool is_incognito() const { return profile_mode_ == PROFILE_MODE_INCOGNITO; }
 
   // Returns the schemes that must be allowed to access FileSystem API
   // in addition to standard "http" and "https".
   // (e.g. If the --allow-file-access-from-files option is given in chrome
   // "file" scheme will also need to be allowed).
   const std::vector<std::string>& additional_allowed_schemes() const {
     return additional_allowed_schemes_;
   }
 
+  leveldb::Env* env_override() const { return env_override_; }
+
  private:
   const ProfileMode profile_mode_;
   const std::vector<std::string> additional_allowed_schemes_;
+  leveldb::Env* env_override_;
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_OPTIONS_H_