Defer ARC file system operations while ARC is booting.

components/arc/file_system/test/fake_arc_file_system_operation_runner.h

+// Copyright 2017 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 COMPONENTS_ARC_FILE_SYSTEM_FAKE_ARC_FILE_SYSTEM_OPERATION_RUNNER_H_
+#define COMPONENTS_ARC_FILE_SYSTEM_FAKE_ARC_FILE_SYSTEM_OPERATION_RUNNER_H_
+
+#include "base/macros.h"
+#include "components/arc/file_system/arc_file_system_operation_runner.h"
+
+namespace arc {
+
+class FakeArcFileSystemOperationRunner : public ArcFileSystemOperationRunner {

[hidehiko, 2017/01/20 08:01:49]

Similar to my comment for FakeArcFileSystemInstance,
could you unify all this class's subclasses into here?

Considering the existing code, I'm fine to addressing this in a following CL
with leaving TODO here,
if it works you better.
Also, better to comment "how to faking" then (i.e., what's the difference from
the real implementation).

[Shuhei Takahashi, 2017/01/20 09:13:04]

Makes sense. Added a TODO here and other unit tests using fakes.

+ public:
+  explicit FakeArcFileSystemOperationRunner(ArcBridgeService* bridge_service);
+  ~FakeArcFileSystemOperationRunner() override;
+
+  // ArcFileSystemOperationRunner overrides.
+  void GetFileSize(const std::string& url,
+                   const GetFileSizeCallback& callback) override;
+  void OpenFileToRead(const std::string& url,
+                      const OpenFileToReadCallback& callback) override;
+  void GetDocument(const std::string& authority,
+                   const std::string& document_id,
+                   const GetDocumentCallback& callback) override;
+  void GetChildDocuments(const std::string& authority,
+                         const std::string& parent_document_id,
+                         const GetChildDocumentsCallback& callback) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FakeArcFileSystemOperationRunner);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_FILE_SYSTEM_FAKE_ARC_FILE_SYSTEM_OPERATION_RUNNER_H_