DO NO SUBMIT: Add CDM_EXPORT to fix tests under ubsan

content_decryption_module.h

Index: content_decryption_module.h
diff --git a/content_decryption_module.h b/content_decryption_module.h
index 28be27b88813893270777d2552c78bfaf976feb1..d1e9b893a97c5017921ab12fdec8b6f6927665c2 100644
--- a/content_decryption_module.h
+++ b/content_decryption_module.h
@@ -644,7 +644,7 @@ class ContentDecryptionModule_7 {
 // provided in CreateCdmInstance() to allocate any Buffer that needs to
 // be passed back to the caller. Implementations must call Buffer::Destroy()
 // when a Buffer is created that will never be returned to the caller.
-class ContentDecryptionModule_8 {
+class CDM_EXPORT ContentDecryptionModule_8 {
  public:
   static const int kVersion = 8;
   typedef Host_8 Host;