Implements cachetool to manipulate simple typed cache.

net/net.gyp

Index: net/net.gyp
diff --git a/net/net.gyp b/net/net.gyp
index a85822fed63e56d7bdebcdf8be1aed8910df4147..6dd7e0403898552951f0ebc543ca99f3e9304d6a 100644
--- a/net/net.gyp
+++ b/net/net.gyp
@@ -805,6 +805,18 @@
       'msvs_disabled_warnings': [4267, ],
     },
     {
+      'target_name': 'cachetool',

[gavinp, 2016/02/19 16:21:11]

I believe this goes above "dump_cache" because we sort these sections
lexicographically by name. Although clearly there's no existing sort, so I guess
you can ignore this.

[gabadie, 2016/02/22 14:35:45]

Done.

+      'type': 'executable',
+      'dependencies': [
+        '../base/base.gyp:base',
+        'net',
+        'net_test_support',
+      ],
+      'sources': [
+        'tools/cachetool/cachetool.cc',
+      ],
+    },
+    {
       'target_name': 'simple_quic_tools',
       'type': 'static_library',
       'dependencies': [