src: add /json/protocol endpoint to inspector

Embed the compressed and minified protocol.json from the bundled
v8_inspector and make it available through the /json/protocol endpoint.

Refs: https://github.com/nodejs/diagnostics/issues/52
PR-URL: https://github.com/nodejs/node/pull/7491
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/compress_json.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import json
+import struct
+import sys
+import zlib
+
+if __name__ == '__main__':
+  fp = open(sys.argv[1])
+  obj = json.load(fp)
+  text = json.dumps(obj, separators=(',', ':'))
+  data = zlib.compress(text, zlib.Z_BEST_COMPRESSION)
+
+  # To make decompression a little easier, we prepend the compressed data
+  # with the size of the uncompressed data as a 24 bits BE unsigned integer.
+  assert len(text) < 1 << 24, 'Uncompressed JSON must be < 16 MB.'
+  data = struct.pack('>I', len(text))[1:4] + data
+
+  step = 20
+  slices = (data[i:i+step] for i in xrange(0, len(data), step))
+  slices = map(lambda s: ','.join(str(ord(c)) for c in s), slices)
+  text = ',\n'.join(slices)
+
+  fp = open(sys.argv[2], 'w')
+  fp.write(text)