Introduce the ENABLE_BROWSER_CDMS macro.

media/base/browser_cdm.h

 // Copyright 2014 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_BASE_BROWSER_CDM_H_
 #define MEDIA_BASE_BROWSER_CDM_H_
 
+#include "media/base/media_export.h"
 #include "media/base/media_keys.h"
 #include "media/base/player_tracker.h"
 
 namespace media {
 
 // Interface for browser side CDMs.
-class BrowserCdm : public PlayerTracker {
+class MEDIA_EXPORT BrowserCdm : public PlayerTracker {
  public:
   // TODO(jrummell): Update this to actually derive from MediaKeys
   // (Use web_session_id rather than session_id).
   typedef base::Callback<
       void(uint32 session_id, const std::string& web_session_id)>
       SessionCreatedCB;
 
   typedef base::Callback<void(uint32 session_id,
                               const std::vector<uint8>& message,
                               const GURL& destination_url)> SessionMessageCB;
@@ skipping 28 matching lines @@
  protected:
    BrowserCdm();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserCdm);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BROWSER_CDM_H_