arc: Empty implementation of ARC content file system

chrome/browser/chromeos/arc/fileapi/arc_content_file_system_backend_delegate.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 "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_backend_delegate.h"
+
+#include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.h"
+#include "content/public/browser/browser_thread.h"
+#include "storage/browser/fileapi/file_stream_writer.h"
+#include "storage/browser/fileapi/file_system_url.h"
+
+namespace arc {
+
+ArcContentFileSystemBackendDelegate::ArcContentFileSystemBackendDelegate()
+    : async_file_util_(new ArcContentFileSystemAsyncFileUtil()) {}
+
+ArcContentFileSystemBackendDelegate::~ArcContentFileSystemBackendDelegate() =
+    default;
+
+storage::AsyncFileUtil* ArcContentFileSystemBackendDelegate::GetAsyncFileUtil(
+    storage::FileSystemType type) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  DCHECK_EQ(storage::kFileSystemTypeArcContent, type);
+  return async_file_util_.get();
+}
+
+std::unique_ptr<storage::FileStreamReader>
+ArcContentFileSystemBackendDelegate::CreateFileStreamReader(
+    const storage::FileSystemURL& url,
+    int64_t offset,
+    int64_t max_bytes_to_read,
+    const base::Time& expected_modification_time,
+    storage::FileSystemContext* context) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  DCHECK_EQ(storage::kFileSystemTypeArcContent, url.type());
+  return std::unique_ptr<storage::FileStreamReader>(
+      new ArcContentFileSystemFileStreamReader(url, offset, max_bytes_to_read));
+}
+
+std::unique_ptr<storage::FileStreamWriter>
+ArcContentFileSystemBackendDelegate::CreateFileStreamWriter(
+    const storage::FileSystemURL& url,
+    int64_t offset,
+    storage::FileSystemContext* context) {
+  NOTIMPLEMENTED();
+  return std::unique_ptr<storage::FileStreamWriter>();
+}
+
+storage::WatcherManager* ArcContentFileSystemBackendDelegate::GetWatcherManager(
+    storage::FileSystemType type) {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+void ArcContentFileSystemBackendDelegate::GetRedirectURLForContents(
+    const storage::FileSystemURL& url,
+    const storage::URLCallback& callback) {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace arc