Add blink_perf.html_to_dom benchmark.

tools/perf/benchmarks/blink_perf.py

Index: tools/perf/benchmarks/blink_perf.py
diff --git a/tools/perf/benchmarks/blink_perf.py b/tools/perf/benchmarks/blink_perf.py
index 3cf3d6550da30fffdbd7ab48a1d29e6c4bea75bc..dc41dc9bc1d6bcaaafa17e1632c688bac7d5127a 100644
--- a/tools/perf/benchmarks/blink_perf.py
+++ b/tools/perf/benchmarks/blink_perf.py
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import os
+import re
 
 from core import path_util
 from core import perf_benchmark
@@ -74,6 +75,12 @@ def CreateStorySetFromPath(path, skipped_file,
 class _BlinkPerfMeasurement(legacy_page_test.LegacyPageTest):
   """Tuns a blink performance test and reports the results."""
 
+  # The line with values has the following format:
+  # values optional_metric_name list_of_values unit.
+  # The metric name must start with a letter or '_' and may contain
+  # letters, digits, '-', '.', and '_'.
+  _VALUES_RE = re.compile(r'^values ([^\d\W][\w.\-]*)?(.*) (\S+)$')
+
   def __init__(self):
     super(_BlinkPerfMeasurement, self).__init__()
     with open(os.path.join(os.path.dirname(__file__),
@@ -101,21 +108,29 @@ class _BlinkPerfMeasurement(legacy_page_test.LegacyPageTest):
 
     log = tab.EvaluateJavaScript('document.getElementById("log").innerHTML')
 
+    unnamed_metric_count = 0
+
     for line in log.splitlines():
-      if line.startswith("FATAL: "):
+      if line.startswith('FATAL: '):
         print line
         continue
+
       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('/', '_')
+
+      match = self._VALUES_RE.match(line)
+      assert match, ('invalid log line with values: %s' % line)
+
+      metric = match.group(1)
+      if not metric:
+        metric = page.display_name.split('.')[0].replace('/', '_')
+        unnamed_metric_count += 1
+        assert unnamed_metric_count <= 1
+      values = [float(v.replace(',', '')) for v in match.group(2).split()]
+      units = match.group(3)
       results.AddValue(list_of_scalar_values.ListOfScalarValues(
           results.current_page, metric, units, values))
 
-      break
-
     print log
 
 
@@ -340,3 +355,16 @@ class BlinkPerfPywebsocket(perf_benchmark.PerfBenchmark):
   @classmethod
   def ShouldDisable(cls, possible_browser):
     return cls.IsSvelte(possible_browser)  # http://crbug.com/551950
+
+
+class BlinkHTMLToDOM(perf_benchmark.PerfBenchmark):
+  tag = 'html_to_dom'
+  test = _BlinkPerfMeasurement
+
+  @classmethod
+  def Name(cls):
+    return 'blink_perf.html_to_dom'
+
+  def CreateStorySet(self, options):
+    path = os.path.join(BLINK_PERF_BASE_DIR, 'HTMLToDOM')
+    return CreateStorySetFromPath(path, SKIPPED_FILE)