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

chrome/browser/sync_file_system/local/local_file_sync_context.cc

 // Copyright 2013 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 "chrome/browser/sync_file_system/local/local_file_sync_context.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/location.h"
 #include "base/platform_file.h"
@@ skipping 29 matching lines @@
 const int kMaxConcurrentSyncableOperation = 3;
 const int kNotifyChangesDurationInSec = 1;
 const int kMaxURLsToFetchForLocalSync = 5;
 
 const base::FilePath::CharType kSnapshotDir[] = FILE_PATH_LITERAL("snapshots");
 
 }  // namespace
 
 LocalFileSyncContext::LocalFileSyncContext(
     const base::FilePath& base_path,
+    leveldb::Env* env_override,
     base::SingleThreadTaskRunner* ui_task_runner,
     base::SingleThreadTaskRunner* io_task_runner)
     : local_base_path_(base_path.Append(FILE_PATH_LITERAL("local"))),
+      env_override_(env_override),
       ui_task_runner_(ui_task_runner),
       io_task_runner_(io_task_runner),
       shutdown_on_ui_(false),
       shutdown_on_io_(false),
       mock_notify_changes_duration_in_sec_(-1) {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 }
 
 void LocalFileSyncContext::MaybeInitializeFileSystemContext(
     const GURL& source_url,
@@ skipping 609 matching lines @@
 
 SyncStatusCode LocalFileSyncContext::InitializeChangeTrackerOnFileThread(
     scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
     FileSystemContext* file_system_context,
     std::set<GURL>* origins_with_changes) {
   DCHECK(file_system_context);
   DCHECK(tracker_ptr);
   DCHECK(origins_with_changes);
   tracker_ptr->reset(new LocalFileChangeTracker(
           file_system_context->partition_path(),
+          env_override_,
           file_system_context->default_file_task_runner()));
   const SyncStatusCode status = (*tracker_ptr)->Initialize(file_system_context);
   if (status != SYNC_STATUS_OK)
     return status;
 
   // Get all origins that have pending changes.
   std::deque<FileSystemURL> urls;
   (*tracker_ptr)->GetNextChangedURLs(&urls, 0);
   for (std::deque<FileSystemURL>::iterator iter = urls.begin();
        iter != urls.end(); ++iter) {
@@ skipping 305 matching lines @@
     return;
   }
 
   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
       file_system_context, dest_url);
   file_system_context->operation_runner()->CopyInForeignFile(
       local_path, url_for_sync, callback);
 }
 
 }  // namespace sync_file_system