Add a telemetry measurement for property tree performance.

tools/perf/benchmarks/draw_properties.py

+# Copyright 2015 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 telemetry import benchmark
+
+from measurements import draw_properties
+import page_sets
+
+
+class DrawPropertiesToughScrolling(benchmark.Benchmark):
+  test = draw_properties.DrawProperties
+  page_set = page_sets.ToughScrollingCasesPageSet
+  @classmethod
+  def Name(cls):
+    return 'draw_properties.tough_scrolling'
+
+class DrawPropertiesTop25(benchmark.Benchmark):
+  """Measures the relative performance of CalcDrawProperties vs computing draw
+  properties from property trees.
+
+  http://www.chromium.org/developers/design-documents/rendering-benchmarks
+  """
+  test = draw_properties.DrawProperties
+  page_set = page_sets.Top25SmoothPageSet
+
+  @classmethod
+  def Name(cls):
+    return 'draw_properties.top_25'