Get a descriptive error name from ICU

net/base/net_util_icu.cc

Index: net/base/net_util_icu.cc
diff --git a/net/base/net_util_icu.cc b/net/base/net_util_icu.cc
index 259baba33bd41ef781afe121579857c95b602dc2..2d18d76386d182962e4732aa05e3676df7e679b5 100644
--- a/net/base/net_util_icu.cc
+++ b/net/base/net_util_icu.cc
@@ -23,6 +23,7 @@
 #include "third_party/icu/source/common/unicode/uniset.h"
 #include "third_party/icu/source/common/unicode/uscript.h"
 #include "third_party/icu/source/common/unicode/uset.h"
+#include "third_party/icu/source/common/unicode/utypes.h"
 #include "third_party/icu/source/i18n/unicode/datefmt.h"
 #include "third_party/icu/source/i18n/unicode/regex.h"
 #include "third_party/icu/source/i18n/unicode/ulocdata.h"
@@ -298,8 +299,11 @@ struct UIDNAWrapper {
     // TODO(jungshik): Change options as different parties (browsers,
     // registrars, search engines) converge toward a consensus.
     value = uidna_openUTS46(UIDNA_CHECK_BIDI, &err);
-    if (U_FAILURE(err))
+    if (U_FAILURE(err)) {
+      CHECK(false) << "failed to open UTS46 data with error: "
+                   << u_errorName(err);
       value = NULL;
+    }
   }
 
   UIDNA* value;