mediaview: Skeleton for ARC Documents Provider FS.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_backend_delegate.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_BACKEND_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_BACKEND_DELEGATE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_async_file_util.h"
+#include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
+
+namespace storage {

[Yusuke Sato, 2016/12/13 18:58:56]

nit: space between L14/15 if you keep this?

[Shuhei Takahashi, 2016/12/14 03:24:55]

Done.

+class AsyncFileUtil;

[Yusuke Sato, 2016/12/13 18:58:56]

nit: why are these forward declarations necessary? Since
chromeos::FileSystemBackendDelegate (the parent class) is visible, and the class
only overrides some of the parent's methods, I think including
chrome/browser/chromeos/fileapi/file_system_backend_delegate.h does the trick,
no?

Actually you're not having base::Time here (for L38) but the code compiles.

[Shuhei Takahashi, 2016/12/14 03:24:55]

Thanks, I agree we don't need them.

+class FileSystemContext;
+class FileStreamReader;
+class FileStreamWriter;
+class FileSystemURL;
+}  // namespace storage

[Yusuke Sato, 2016/12/13 18:58:56]

same

[Shuhei Takahashi, 2016/12/14 03:24:55]

Done.

+
+namespace arc {
+
+// Implements ARC documents provider filesystem.
+class ArcDocumentsProviderBackendDelegate
+    : public chromeos::FileSystemBackendDelegate {
+ public:
+  ArcDocumentsProviderBackendDelegate();
+  ~ArcDocumentsProviderBackendDelegate() override;
+
+  // FileSystemBackend::Delegate overrides.
+  storage::AsyncFileUtil* GetAsyncFileUtil(
+      storage::FileSystemType type) override;
+  std::unique_ptr<storage::FileStreamReader> CreateFileStreamReader(
+      const storage::FileSystemURL& url,
+      int64_t offset,
+      int64_t max_bytes_to_read,
+      const base::Time& expected_modification_time,
+      storage::FileSystemContext* context) override;
+  std::unique_ptr<storage::FileStreamWriter> CreateFileStreamWriter(
+      const storage::FileSystemURL& url,
+      int64_t offset,
+      storage::FileSystemContext* context) override;
+  storage::WatcherManager* GetWatcherManager(
+      storage::FileSystemType type) override;
+  void GetRedirectURLForContents(const storage::FileSystemURL& url,
+                                 const storage::URLCallback& callback) override;
+
+ private:
+  ArcDocumentsProviderAsyncFileUtil async_file_util_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcDocumentsProviderBackendDelegate);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_BACKEND_DELEGATE_H_