Extract CdmManager from MojoCdmService.

media/cdm/cdm_manager_export.h

Index: media/cdm/cdm_manager_export.h
diff --git a/media/cdm/cdm_manager_export.h b/media/cdm/cdm_manager_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..fc65a72aafdf3475a1246ef39b5d20526f6f8599
--- /dev/null
+++ b/media/cdm/cdm_manager_export.h
@@ -0,0 +1,32 @@
+// 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 MEDIA_CDM_CDM_MANAGER_EXPORT_H_
+#define MEDIA_CDM_CDM_MANAGER_EXPORT_H_
+
+// Define CDM_MANAGER_EXPORT so that functionality implemented by the
+// cdm_manager component can be exported to consumers.
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(CDM_MANAGER_IMPLEMENTATION)
+#define CDM_MANAGER_EXPORT __declspec(dllexport)
+#else
+#define CDM_MANAGER_EXPORT __declspec(dllimport)
+#endif  // defined(CDM_MANAGER_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(CDM_MANAGER_IMPLEMENTATION)
+#define CDM_MANAGER_EXPORT __attribute__((visibility("default")))
+#else
+#define CDM_MANAGER_EXPORT
+#endif
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define CDM_MANAGER_EXPORT
+#endif
+
+#endif  // MEDIA_BASE_CDM_MANAGER_EXPORT_H_