tools/perf/page_sets/repaint_helpers.py

   1 # Copyright 2014 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 from telemetry.page import page_test
   6
   7
   8 def Repaint(action_runner, mode='viewport', width=None, height=None):
   9   action_runner.WaitForJavaScriptCondition(
  10     'document.readyState == "complete"', 90)
  11   # Rasterize only what's visible.
  12   action_runner.ExecuteJavaScript(
  13       'chrome.gpuBenchmarking.setRasterizeOnlyVisibleContent();')
  14
  15   args = {}
  16   args['mode'] = mode
  17   if width:
  18     args['width'] = width
  19   if height:
  20     args['height'] = height
  21
  22   # Enque benchmark
  23   action_runner.ExecuteJavaScript("""
  24       window.benchmark_results = {};
  25       window.benchmark_results.id =
  26           chrome.gpuBenchmarking.runMicroBenchmark(
  27               "invalidation_benchmark",
  28               function(value) {},
  29               """ + str(args) + """
  30           );
  31   """)
  32
  33   micro_benchmark_id = action_runner.EvaluateJavaScript(
  34       'window.benchmark_results.id')
  35   if not micro_benchmark_id:
  36     raise page_test.MeasurementFailure(
  37         'Failed to schedule invalidation_benchmark.')
  38
  39   with action_runner.CreateInteraction('Repaint'):
  40     action_runner.RepaintContinuously(seconds=5)
  41
  42   action_runner.ExecuteJavaScript("""
  43       window.benchmark_results.message_handled =
  44           chrome.gpuBenchmarking.sendMessageToMicroBenchmark(
  45               """ + str(micro_benchmark_id) + """, {
  46                 "notify_done": true
  47               });
  48   """)