Add tests for QuicTextUtils::HexEncode and HexDecode which use non-ASCII printable data.

net/quic/platform/api/quic_text_utils_test.cc

Index: net/quic/platform/api/quic_text_utils_test.cc
diff --git a/net/quic/platform/api/quic_text_utils_test.cc b/net/quic/platform/api/quic_text_utils_test.cc
index c424a36dd7afb319c8cd5ed07f0620738ff8065f..49efeb16182f7865eddcc3559957e981cf13b79e 100644
--- a/net/quic/platform/api/quic_text_utils_test.cc
+++ b/net/quic/platform/api/quic_text_utils_test.cc
@@ -71,11 +71,13 @@ TEST(QuicTextUtilsText, HexEncode) {
   EXPECT_EQ("48656c6c6f", QuicTextUtils::HexEncode("Hello", 5));
   EXPECT_EQ("48656c6c6f", QuicTextUtils::HexEncode("Hello World", 5));
   EXPECT_EQ("48656c6c6f", QuicTextUtils::HexEncode("Hello"));
+  EXPECT_EQ("0102779cfa", QuicTextUtils::HexEncode("\x01\x02\x77\x9c\xfa"));
 }
 
 TEST(QuicTextUtilsText, HexDecode) {
   EXPECT_EQ("Hello", QuicTextUtils::HexDecode("48656c6c6f"));
   EXPECT_EQ("", QuicTextUtils::HexDecode(""));
+  EXPECT_EQ("\x01\x02\x77\x9c\xfa", QuicTextUtils::HexDecode("0102779cfa"));
 }
 
 TEST(QuicTextUtilsText, HexDump) {