Add gyp files to build NSS in Dart

runtime/bin/bin.gypi

Index: runtime/bin/bin.gypi
diff --git a/runtime/bin/bin.gypi b/runtime/bin/bin.gypi
index b9658b617489972141ac229cacd34945609ec429..7cb4feb3b6cba873c9ac7df13d972136fa626d6d 100644
--- a/runtime/bin/bin.gypi
+++ b/runtime/bin/bin.gypi
@@ -306,6 +306,9 @@
     {
       'target_name': 'libdart_io',
       'type': 'static_library',
+      'dependencies': [
+        'nss',

[Ivan Posva, 2012/11/09 23:00:20]

Can you list the different nss dependencies here? I would hope that this would
remove the need for 'export_dependent_settings' from below.

+      ],
       'include_dirs': [
         '..',
       ],
@@ -334,6 +337,28 @@
       ],
     },
     {
+      'target_name': 'nss',
+      'type': 'none',
+      'dependencies': [
+        'bin/net/nss.gyp:nss',
+        'bin/net/nss.gyp:nspr',
+        'bin/net/nss.gyp:nssckbi',
+        'bin/net/nss.gyp:nss_static',
+        'bin/net/ssl.gyp:libssl',
+        'bin/net/zlib.gyp:zlib',
+        'bin/net/sqlite.gyp:sqlite',
+      ],
+      'export_dependent_settings': [
+        'bin/net/nss.gyp:nss',
+        'bin/net/nss.gyp:nspr',
+        'bin/net/nss.gyp:nssckbi',
+        'bin/net/nss.gyp:nss_static',
+        'bin/net/ssl.gyp:libssl',
+        'bin/net/zlib.gyp:zlib',
+        'bin/net/sqlite.gyp:sqlite',
+      ],
+    },
+    {
       'target_name': 'libdart_withcore',
       'type': 'static_library',
       'dependencies': [