Add a new QUIC platform API for text utilities.

net/quic/core/crypto/aes_128_gcm_12_encrypter_test.cc

Index: net/quic/core/crypto/aes_128_gcm_12_encrypter_test.cc
diff --git a/net/quic/core/crypto/aes_128_gcm_12_encrypter_test.cc b/net/quic/core/crypto/aes_128_gcm_12_encrypter_test.cc
index 037d90f77e0ee085fd413c41d06804382091ff14..9236329b8a83cc8b3cbd0d25bf9da33b70a5a74a 100644
--- a/net/quic/core/crypto/aes_128_gcm_12_encrypter_test.cc
+++ b/net/quic/core/crypto/aes_128_gcm_12_encrypter_test.cc
@@ -7,6 +7,7 @@
 #include <memory>
 
 #include "net/quic/core/quic_utils.h"
+#include "net/quic/platform/api/quic_text_utils.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 
 using base::StringPiece;
@@ -178,12 +179,12 @@ TEST(Aes128Gcm12EncrypterTest, Encrypt) {
     const TestGroupInfo& test_info = test_group_info[i];
     for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
       // Decode the test vector.
-      string key = QuicUtils::HexDecode(test_vectors[j].key);
-      string iv = QuicUtils::HexDecode(test_vectors[j].iv);
-      string pt = QuicUtils::HexDecode(test_vectors[j].pt);
-      string aad = QuicUtils::HexDecode(test_vectors[j].aad);
-      string ct = QuicUtils::HexDecode(test_vectors[j].ct);
-      string tag = QuicUtils::HexDecode(test_vectors[j].tag);
+      string key = QuicTextUtils::HexDecode(test_vectors[j].key);
+      string iv = QuicTextUtils::HexDecode(test_vectors[j].iv);
+      string pt = QuicTextUtils::HexDecode(test_vectors[j].pt);
+      string aad = QuicTextUtils::HexDecode(test_vectors[j].aad);
+      string ct = QuicTextUtils::HexDecode(test_vectors[j].ct);
+      string tag = QuicTextUtils::HexDecode(test_vectors[j].tag);
 
       // The test vector's lengths should look sane. Note that the lengths
       // in |test_info| are in bits.