fix(NddService): fix NddService socket.on('data') for large input

This patch fixes NddService.server socker.on('data') so that it can handle large amounts of input without throwing `SyntaxError: Unexpected end of JSON input` errors.

Fixes GoogleChromeLabs#319

services/ndd_service.js

@@ -95,16 +95,22 @@ class NddService {
     const pipeName = `node-ndb.${process.pid}.sock`;
     this._pipe = path.join(pipePrefix, pipeName);
     const server = net.createServer(socket => {
+      let chunks = [];
       socket.on('data', async d => {
-        const runSession = await this._startSession(JSON.parse(d), frontend);
+        chunks.push(d)
+      });
+      socket.on('end', async () => {
+        let data = Buffer.concat(chunks);
+        const runSession = await this._startSession(JSON.parse(data), frontend);
         socket.write('run');
         runSession();
-      });
+      })
       socket.on('error', e => caughtErrorDebug(e));
     }).listen(this._pipe);
     server.unref();
   }
 
+
   dispose() {
     process.disconnect();
   }