[Telemetry] Reorganize everything.

tools/telemetry/telemetry/core/chrome/browser_backend.py

 # Copyright (c) 2012 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 urllib2
 import httplib
 import socket
 import json
 import re
 import sys
 
-from telemetry import browser_gone_exception
-from telemetry import extension_dict_backend
-from telemetry import options_for_unittests
-from telemetry import tab_list_backend
-from telemetry import tracing_backend
-from telemetry import user_agent
-from telemetry import util
-from telemetry import wpr_modes
-from telemetry import wpr_server
+from telemetry.core import util
+from telemetry.core import exceptions
+from telemetry.core import user_agent
+from telemetry.core import wpr_modes
+from telemetry.core import wpr_server
+from telemetry.core.chrome import extension_dict_backend
+from telemetry.core.chrome import tab_list_backend
+from telemetry.core.chrome import tracing_backend
+from telemetry.test import options_for_unittests
 
 class ExtensionsNotSupportedException(Exception):
   pass
 
 class BrowserBackend(object):
   """A base class for browser backends. Provides basic functionality
   once a remote-debugger port has been established."""
 
   WEBPAGEREPLAY_HOST = '127.0.0.1'
 
@@ skipping 76 matching lines @@
     def IsBrowserUp():
       try:
         self.Request('', timeout=timeout)
       except (socket.error, httplib.BadStatusLine, urllib2.URLError):
         return False
       else:
         return True
     try:
       util.WaitFor(IsBrowserUp, timeout=30)
     except util.TimeoutException:
-      raise browser_gone_exception.BrowserGoneException()
+      raise exceptions.BrowserGoneException()
 
     def AllExtensionsLoaded():
       for e in self.options.extensions_to_load:
         extension_id = e.extension_id()
         if not extension_id in self._extension_dict_backend:
           return False
         extension_object = self._extension_dict_backend[extension_id]
         extension_object.WaitForDocumentReadyStateToBeInteractiveOrBetter()
       return True
     if self._supports_extensions:
@@ skipping 70 matching lines @@
       self._tracing_backend = None
 
   def CreateForwarder(self, *port_pairs):
     raise NotImplementedError()
 
   def IsBrowserRunning(self):
     raise NotImplementedError()
 
   def GetStandardOutput(self):
     raise NotImplementedError()