[telemetry] Move telemetry/core/chrome/ to telemetry/core/backends/chrome/

tools/telemetry/telemetry/core/chrome/websocket_browser_connection.py

-# Copyright 2013 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.
-
-import json
-import logging
-import socket
-
-from telemetry.core import util
-from telemetry.core.chrome import websocket
-
-class WebSocketBrowserConnection(object):
-  """Represents a websocket connection to the browser for backends
-     which use one."""
-
-  def __init__(self, devtools_port):
-    debugger_url = 'ws://localhost:%i/devtools/browser' % devtools_port
-    self._socket = websocket.create_connection(debugger_url)
-    self._next_request_id = 0
-    self._cur_socket_timeout = 0
-
-  def Close(self):
-    if self._socket:
-      self._socket.close()
-      self._socket = None
-
-  def SendRequest(self, req, timeout=10):
-    self._SetTimeout(timeout)
-    req['id'] = self._next_request_id
-    self._next_request_id += 1
-    data = json.dumps(req)
-    logging.debug('will send [%s]', data)
-    self._socket.send(data)
-
-  def SyncRequest(self, req, timeout=10):
-    self.SendRequest(req, timeout)
-    while True:
-      try:
-        data = self._socket.recv()
-      except (socket.error, websocket.WebSocketException):
-        raise util.TimeoutException(
-            "Timed out waiting for reply. This is unusual.")
-      res = json.loads(data)
-      logging.debug('got [%s]', data)
-      if res['id'] != req['id']:
-        logging.debug('Dropped reply: %s', json.dumps(res))
-        continue
-      return res
-
-  @property
-  def socket(self):
-    """Returns the socket for raw access. Please be sure you know what
-       you are doing."""
-    return self._socket
-
-  def _SetTimeout(self, timeout):
-    if self._cur_socket_timeout != timeout:
-      self._socket.settimeout(timeout)
-      self._cur_socket_timeout = timeout