Adding openssl_bio_string to GN build.

BUG=

Review URL: https://codereview.chromium.org/643703008

Cr-Commit-Position: refs/heads/master@{#301368}

crypto/BUILD.gn

@@ -49,6 +49,8 @@ component("crypto") {
     "nss_util.cc",
     "nss_util.h",
     "nss_util_internal.h",
+    "openssl_bio_string.cc",
+    "openssl_bio_string.h",
     "openssl_util.cc",
     "openssl_util.h",
     "p224.cc",
@@ -151,6 +153,8 @@ component("crypto") {
       "ec_signature_creator_openssl.cc",
       "encryptor_openssl.cc",
       "hmac_openssl.cc",
+      "openssl_bio_string.cc",
+      "openssl_bio_string.h",
       "openssl_util.cc",
       "openssl_util.h",
       "rsa_private_key_openssl.cc",
@@ -205,6 +209,7 @@ test("crypto_unittests") {
     "hkdf_unittest.cc",
     "hmac_unittest.cc",
     "nss_util_unittest.cc",
+    "openssl_bio_string_unittest.cc",
     "p224_unittest.cc",
     "p224_spake_unittest.cc",
     "random_unittest.cc",
@@ -225,6 +230,8 @@ test("crypto_unittests") {
 
   if (use_openssl) {
     sources -= [ "nss_util_unittest.cc" ]
+  } else {
+    sources -= [ "openssl_bio_string_unittest.cc" ]
   }
 
   deps = [