Merge "Added mutex for reserved_license_ids_." into tm-dev

libwvdrmengine/cdm/core/include/device_files.h

@@ -5,6 +5,7 @@
 #ifndef WVCDM_CORE_DEVICE_FILES_H_
 #define WVCDM_CORE_DEVICE_FILES_H_
 
+#include <mutex>
 #include <set>
 #include <string>
 #include <vector>
@@ -369,6 +370,7 @@ class DeviceFiles {
 #endif
 
   static std::set<std::string> reserved_license_ids_;
+  static std::mutex reserved_license_ids_mutex_;
 
   wvutil::FileSystem* file_system_;
   CdmSecurityLevel security_level_;