media: Always provide CdmContext when selecting decoder in DecoderStream

content/renderer/media/cdm/ppapi_decryptor.h

Index: content/renderer/media/cdm/ppapi_decryptor.h
diff --git a/content/renderer/media/cdm/ppapi_decryptor.h b/content/renderer/media/cdm/ppapi_decryptor.h
index 95137fefe01d377f1f7eba612f11e0a79d1387c7..107c655db14fe1f2b136a468f0aff5087ea43478 100644
--- a/content/renderer/media/cdm/ppapi_decryptor.h
+++ b/content/renderer/media/cdm/ppapi_decryptor.h
@@ -13,6 +13,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/synchronization/lock.h"
 #include "content/renderer/media/cdm/pepper_cdm_wrapper.h"
 #include "media/base/cdm_context.h"
 #include "media/base/cdm_factory.h"
@@ -148,6 +149,9 @@ class PpapiDecryptor : public media::ContentDecryptionModule,
   NewKeyCB new_audio_key_cb_;
   NewKeyCB new_video_key_cb_;
 
+  base::Lock lock_;  // Protects |had_fatal_plugin_error_|.
+  bool had_fatal_plugin_error_ = false;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<PpapiDecryptor> weak_ptr_factory_;