Add VerifyHostFiles()

content_decryption_module_export.h

Index: content_decryption_module_export.h
diff --git a/content_decryption_module_export.h b/content_decryption_module_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..fbd675c411bd9c3528608c68204271e990aa754e
--- /dev/null
+++ b/content_decryption_module_export.h
@@ -0,0 +1,22 @@
+// 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 CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
+
+// Define CDM_API so that functionality implemented by the CDM module
+// can be exported to consumers.
+#if defined(WIN32)
+
+#if defined(CDM_IMPLEMENTATION)
+#define CDM_API __declspec(dllexport)
+#else
+#define CDM_API __declspec(dllimport)
+#endif  // defined(CDM_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#define CDM_API __attribute__((visibility("default")))
+#endif  // defined(WIN32)
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_