[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/page_sets/tough_webgl_cases.py

 # 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 page_sets import webgl_supported_shared_state
 
-from telemetry.page import shared_page_state
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
+from telemetry.page import shared_page_state
+
+from page_sets import webgl_supported_shared_state
 
 
 class ToughWebglCasesPage(page_module.Page):
 
   def __init__(self, url, page_set):
     super(ToughWebglCasesPage, self).__init__(
         url=url, page_set=page_set,
         shared_page_state_class=(
             webgl_supported_shared_state.WebGLSupportedSharedState))
     self.archive_data_file = 'data/tough_webgl_cases.json'
@@ skipping 30 matching lines @@
       'http://www.khronos.org/registry/webgl/sdk/demos/webkit/Earth.html',
       # pylint: disable=C0301
       'http://www.khronos.org/registry/webgl/sdk/demos/webkit/ManyPlanetsDeep.html',
       'http://webglsamples.googlecode.com/hg/aquarium/aquarium.html',
       'http://webglsamples.googlecode.com/hg/blob/blob.html',
       # pylint: disable=C0301
       'http://webglsamples.googlecode.com/hg/dynamic-cubemap/dynamic-cubemap.html'
     ]
     for url in urls_list:
       self.AddUserStory(ToughWebglCasesPage(url, self))