[telemetry] Make single-benchmark measurements protected and undiscoverable.

tools/perf/benchmarks/blink_perf.py

 # Copyright (c) 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 os
+import sys
 
 from telemetry import test
 from telemetry.core import util
+from telemetry.page import page_measurement
+from telemetry.page import page_set
 
-from measurements import blink_perf
+
+def _CreatePageSetFromPath(path):
+  assert os.path.exists(path)
+
+  page_set_dict = {'pages': []}
+
+  def _AddPage(path):
+    if not path.endswith('.html'):
+      return
+    if '../' in open(path, 'r').read():
+      # If the page looks like it references its parent dir, include it.
+      page_set_dict['serving_dirs'] = [os.path.dirname(os.path.dirname(path))]
+    page_set_dict['pages'].append({'url':
+                                   'file://' + path.replace('\\', '/')})
+
+  def _AddDir(dir_path, skipped):
+    for candidate_path in os.listdir(dir_path):
+      if candidate_path == 'resources':
+        continue
+      candidate_path = os.path.join(dir_path, candidate_path)
+      if candidate_path.startswith(tuple([os.path.join(path, s)
+                                          for s in skipped])):
+        continue
+      if os.path.isdir(candidate_path):
+        _AddDir(candidate_path, skipped)
+      else:
+        _AddPage(candidate_path)
+
+  if os.path.isdir(path):
+    skipped = []
+    skipped_file = os.path.join(path, 'Skipped')
+    if os.path.exists(skipped_file):
+      for line in open(skipped_file, 'r').readlines():
+        line = line.strip()
+        if line and not line.startswith('#'):
+          skipped.append(line.replace('/', os.sep))
+    _AddDir(path, skipped)
+  else:
+    _AddPage(path)
+  return page_set.PageSet.FromDict(page_set_dict, os.getcwd() + os.sep)
+
+
+class _BlinkPerfMeasurement(page_measurement.PageMeasurement):
+  """Tuns a blink performance test and reports the results."""
+  def __init__(self):
+    super(_BlinkPerfMeasurement, self).__init__('')
+    with open(os.path.join(os.path.dirname(__file__),
+                           'blink_perf.js'), 'r') as f:
+      self._blink_perf_js = f.read()
+
+  def CreatePageSet(self, args, options):
+    if len(args) < 2:
+      print 'Must specify a file or directory to run.'
+      sys.exit(1)
+
+    page_set_arg = args[1]
+
+    if not os.path.exists(page_set_arg):
+      print '%s does not exist.' % page_set_arg
+      sys.exit(1)
+
+    return _CreatePageSetFromPath(page_set_arg)
+
+  @property
+  def results_are_the_same_on_every_page(self):
+    return False
+
+  def WillNavigateToPage(self, page, tab):
+    page.script_to_evaluate_on_commit = self._blink_perf_js
+
+  def CustomizeBrowserOptions(self, options):
+    options.AppendExtraBrowserArgs([
+        '--js-flags=--expose_gc',
+        '--enable-experimental-web-platform-features'
+    ])
+
+  def MeasurePage(self, page, tab, results):
+    tab.WaitForJavaScriptExpression('testRunner.isDone', 600)
+
+    log = tab.EvaluateJavaScript('document.getElementById("log").innerHTML')
+
+    for line in log.splitlines():
+      if not line.startswith('values '):
+        continue
+      parts = line.split()
+      values = [float(v.replace(',', '')) for v in parts[1:-1]]
+      units = parts[-1]
+      metric = page.display_name.split('.')[0].replace('/', '_')
+      results.Add(metric, units, values)
+      break
+
+    print log
 
 
 class BlinkPerfAll(test.Test):
   tag = 'all'
-  test = blink_perf.BlinkPerf
+  test = _BlinkPerfMeasurement
 
   def CreatePageSet(self, options):
     path = os.path.join(
         util.GetChromiumSrcDir(), 'third_party', 'WebKit', 'PerformanceTests')
-    return blink_perf.CreatePageSetFromPath(path)
+    return _CreatePageSetFromPath(path)
 
 class BlinkPerfAnimation(test.Test):
   tag = 'animation'
-  test = blink_perf.BlinkPerf
+  test = _BlinkPerfMeasurement
 
   def CreatePageSet(self, options):
     path = os.path.join(util.GetChromiumSrcDir(),
         'third_party', 'WebKit', 'PerformanceTests', 'Animation')
-    return blink_perf.CreatePageSetFromPath(path)
+    return _CreatePageSetFromPath(path)
 
 class BlinkPerfWebAnimations(test.Test):
   tag = 'web_animations'
-  test = blink_perf.BlinkPerf
+  test = _BlinkPerfMeasurement
   enabled = False
 
   def CreatePageSet(self, options):
     path = os.path.join(util.GetChromiumSrcDir(),
         'third_party', 'WebKit', 'PerformanceTests', 'Animation')
-    return blink_perf.CreatePageSetFromPath(path)
+    return _CreatePageSetFromPath(path)
 
   def CustomizeBrowserOptions(self, options):
     options.AppendExtraBrowserArgs('--enable-web-animations-css')