Add pprof support to skydb

sky/tools/skydb

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from skypy.skyserver import SkyServer
 import argparse
 import json
 import logging
 import os
@@ skipping 369 matching lines @@
         gdb_attach_parser = subparsers.add_parser('gdb_attach',
             help='launch gdb and attach to gdbserver launched from start --gdb')
         gdb_attach_parser.set_defaults(func=self.gdb_attach_command)
 
         self._add_basic_command(subparsers, 'trace', '/trace',
             'toggle tracing')
         self._add_basic_command(subparsers, 'reload', '/reload',
             'reload the current page')
         self._add_basic_command(subparsers, 'inspect', '/inspect',
             'stop the running sky instance')
+        self._add_basic_command(subparsers, 'start_profiling', '/start_profiling',
+            'starts profiling the running sky instance (Linux only)')
+        self._add_basic_command(subparsers, 'stop_profiling', '/stop_profiling',
+            'stios profiling the running sky instance (Linux only)')
 
         load_parser = subparsers.add_parser('load',
             help='load a new page in the currently running sky')
         load_parser.add_argument('url_or_path', type=str)
         load_parser.set_defaults(func=self.load_command)
 
         args = parser.parse_args()
         args.func(args)
 
         self._write_pid_file(PID_FILE_PATH, self.pids)
 
 
 if __name__ == '__main__':
     SkyDebugger().main()