27 lines
911 B
Python
27 lines
911 B
Python
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# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from metrics import Metric
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class LoadingMetric(Metric):
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"""A metric for page loading time based entirely on window.performance"""
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def Start(self, page, tab):
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raise NotImplementedError()
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def Stop(self, page, tab):
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raise NotImplementedError()
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def AddResults(self, tab, results):
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load_timings = tab.EvaluateJavaScript('window.performance.timing')
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load_time_ms = (
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float(load_timings['loadEventStart']) -
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load_timings['navigationStart'])
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dom_content_loaded_time_ms = (
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float(load_timings['domContentLoadedEventStart']) -
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load_timings['navigationStart'])
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results.Add('load_time', 'ms', load_time_ms)
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results.Add('dom_content_loaded_time', 'ms',
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dom_content_loaded_time_ms)
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