Add a slimming paint variant of the typical 25 page cycler benchmark

tools/perf/benchmarks/page_cycler.py

Index: tools/perf/benchmarks/page_cycler.py
diff --git a/tools/perf/benchmarks/page_cycler.py b/tools/perf/benchmarks/page_cycler.py
index 103afad32f765a58cc28878c62369563ce6c1c7f..dc7dd713876db19be0473d0f9fc79b0ca858229e 100644
--- a/tools/perf/benchmarks/page_cycler.py
+++ b/tools/perf/benchmarks/page_cycler.py
@@ -229,6 +229,22 @@ class PageCyclerOopifTypical25(_PageCycler):
   def CreatePageSet(self, options):
     return page_sets.Typical25PageSet(run_no_page_interactions=True)
 
+# crbug.com/273986: This test is flakey on Windows.
+@benchmark.Disabled('win')
+class PageCyclerSlimmingPaintTypical25(_PageCycler):
+  """A varation of the typical 25 benchmark, but running with
+  --enable-slimming-paint to measure slimming paint.
+  """
+  @classmethod
+  def Name(cls):
+    return 'page_cycler_slimming_paint.typical_25'
+
+  def CustomizeBrowserOptions(self, options):
+    options.AppendExtraBrowserArgs(['--enable-slimming-paint'])
+
+  def CreatePageSet(self, options):
+    return page_sets.Typical25PageSet(run_no_page_interactions=True)
+
 @benchmark.Disabled # crbug.com/443730
 class PageCyclerBigJs(_PageCycler):
   page_set = page_sets.BigJsPageSet