Add a CAVP tool for ECDSA2 SigVer tests.

Change-Id: If3510b207793870f330c8981ef8e996949042fdc
Reviewed-on: https://boringssl-review.googlesource.com/15668
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/test/file_test.h b/crypto/test/file_test.h
index 18d7e99..aac9289 100644
--- a/crypto/test/file_test.h
+++ b/crypto/test/file_test.h
@@ -49,6 +49,15 @@
 //
 //   [Name]
 //
+// Commas in instruction lines are treated as separate instructions. Thus this:
+//
+//   [Name1,Name2]
+//
+// is the same as:
+//
+//   [Name1]
+//   [Name2]
+//
 // Either '=' or ':' may be used to delimit the name from the value. Both the
 // name and value have leading and trailing spaces stripped.
 //