Add CdmFileIOProvider interface for use by cdm_adapter

media/cdm/simple_cdm_file_io_provider.h

Index: media/cdm/simple_cdm_file_io_provider.h
diff --git a/media/cdm/simple_cdm_file_io_provider.h b/media/cdm/simple_cdm_file_io_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..d43cb11972909f738c0984c513bf3719cfd2e02b
--- /dev/null
+++ b/media/cdm/simple_cdm_file_io_provider.h
@@ -0,0 +1,28 @@
+// 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 MEDIA_CDM_SIMPLE_CDM_FILE_IO_PROVIDER_H_
+#define MEDIA_CDM_SIMPLE_CDM_FILE_IO_PROVIDER_H_
+
+#include "base/macros.h"
+#include "media/cdm/cdm_file_io_provider.h"
+
+namespace media {
+
+// This is a simple CdmFileIOProvider for testing.
+class SimpleCdmFileIOProvider : public CdmFileIOProvider {
+ public:
+  SimpleCdmFileIOProvider();
+  ~SimpleCdmFileIOProvider() final;
+
+  // CdmFileIOProvider implementation.
+  cdm::FileIO* CreateFileIO(cdm::FileIOClient* client) final;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SimpleCdmFileIOProvider);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_SIMPLE_CDM_FILE_IO_PROVIDER_H_