arc: IPC definition of file system interfaces.

components/arc/common/file_system.mojom

Index: components/arc/common/file_system.mojom
diff --git a/components/arc/common/file_system.mojom b/components/arc/common/file_system.mojom
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+// 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.
+
+module arc.mojom;
+
+interface FileSystemInstance {
+  // Requests MediaProvider to scan specified files.
+  // When the specified file does not exist, the corresponding entry in
+  // MediaProvider is removed.
+  RequestMediaScan@0(array<string> paths);
+};