CopyOutputResult must have a working release callback when received over mojo

cc/ipc/copy_output_result_struct_traits.h

Index: cc/ipc/copy_output_result_struct_traits.h
diff --git a/cc/ipc/copy_output_result_struct_traits.h b/cc/ipc/copy_output_result_struct_traits.h
index 727ac7c67136f7520bdc3f26ddd0ce915c0ae34d..e18d7ab1025a3793023c87dd26a08725c24ed031 100644
--- a/cc/ipc/copy_output_result_struct_traits.h
+++ b/cc/ipc/copy_output_result_struct_traits.h
@@ -6,6 +6,7 @@
 #define CC_IPC_COPY_OUTPUT_RESULT_STRUCT_TRAITS_H_
 
 #include "cc/ipc/copy_output_result.mojom-shared.h"
+#include "cc/ipc/texture_mailbox_releaser.mojom.h"
 #include "cc/ipc/texture_mailbox_struct_traits.h"
 #include "cc/output/copy_output_result.h"
 #include "skia/public/interfaces/bitmap_skbitmap_struct_traits.h"
@@ -29,6 +30,9 @@ struct StructTraits<cc::mojom::CopyOutputResultDataView,
     return result->texture_mailbox_;
   }
 
+  static cc::mojom::TextureMailboxReleaserPtr releaser(
+      const std::unique_ptr<cc::CopyOutputResult>& result);
+
   static bool Read(cc::mojom::CopyOutputResultDataView data,
                    std::unique_ptr<cc::CopyOutputResult>* out_p);
 };