dart:io | Add SecureSocket.importPrivateCertificates, that reads a PKCS#12 file.

runtime/bin/net/nss.gyp

Index: runtime/bin/net/nss.gyp
diff --git a/runtime/bin/net/nss.gyp b/runtime/bin/net/nss.gyp
index e1c64e113dab323413fe9daad75176acb888434c..dbc685a7c48f2be213430992eec86786bf117655 100644
--- a/runtime/bin/net/nss.gyp
+++ b/runtime/bin/net/nss.gyp
@@ -17,6 +17,7 @@
   'variables': {
     # Added by Dart.
     'nss_directory': '../../../third_party/nss',
+    'pkcs12_directory': '../../../third_party/nss_pkcs12',
     'conditions': [
       ['OS=="ios"', {
         'exclude_nss_root_certs%': 0,
@@ -1068,6 +1069,19 @@
         '<(nss_directory)/nss/lib/util/utilpars.h',
         '<(nss_directory)/nss/lib/util/utilparst.h',
         '<(nss_directory)/nss/lib/util/utilrename.h',
+        '<(pkcs12_directory)/p12creat.c',
+        '<(pkcs12_directory)/p12d.c',
+        '<(pkcs12_directory)/p12dec.c',
+        '<(pkcs12_directory)/p12e.c',
+        '<(pkcs12_directory)/p12.h',
+        '<(pkcs12_directory)/p12local.c',
+        '<(pkcs12_directory)/p12local.h',
+        '<(pkcs12_directory)/p12plcy.c',
+        '<(pkcs12_directory)/p12plcy.h',
+        '<(pkcs12_directory)/p12t.h',
+        '<(pkcs12_directory)/p12tmpl.c',
+        '<(pkcs12_directory)/pkcs12.h',
+        '<(pkcs12_directory)/pkcs12t.h',
       ],
       'sources!': [
         # mpi_arm.c is included by mpi_arm_mac.c.
@@ -1133,6 +1147,7 @@
         '<(nss_directory)/nss/lib/softoken',
         '<(nss_directory)/nss/lib/ssl',
         '<(nss_directory)/nss/lib/util',
+        '<(pkcs12_directory)',
       ],
       'direct_dependent_settings': {
         'defines': [
@@ -1159,6 +1174,7 @@
           '<(nss_directory)/nss/lib/smime',
           '<(nss_directory)/nss/lib/softoken',
           '<(nss_directory)/nss/lib/util',
+          '<(pkcs12_directory)',
         ],
       },
       'msvs_disabled_warnings': [4018, 4101, 4267, ],