Add new trivial sites memory benchmark.

tools/perf/benchmarks/memory.py

Index: tools/perf/benchmarks/memory.py
diff --git a/tools/perf/benchmarks/memory.py b/tools/perf/benchmarks/memory.py
index eb7baa01e041b41dba2bb25413bdba4779f1c588..3b0df041247a9c3642998a2950d67d706018864b 100644
--- a/tools/perf/benchmarks/memory.py
+++ b/tools/perf/benchmarks/memory.py
@@ -51,6 +51,29 @@ class _MemoryInfra(perf_benchmark.PerfBenchmark):
     options.clear_sytem_cache_for_browser_and_profile_on_start = True
 
 
+@benchmark.Enabled('mac')
+@benchmark.Enabled('win')
+@benchmark.Owner(emails=['erikchen@chromium.org'])
+class MemoryBenchmarkTrivialSitesDesktop(_MemoryInfra):
+  """Measure memory usage on trivial sites."""
+  page_set = page_sets.TrivialSitesStorySet
+  options = {'pageset_repeat': 5}
+
+  @classmethod
+  def Name(cls):
+    return 'memory.desktop'
+
+  @classmethod
+  def ShouldTearDownStateAfterEachStoryRun(cls):
+    return True
+
+  @classmethod
+  def ValueCanBeAddedPredicate(cls, value, is_first_result):
+    # TODO(crbug.com/610962): Remove this stopgap when the perf dashboard
+    # is able to cope with the data load generated by TBMv2 metrics.
+    return not _IGNORED_STATS_RE.search(value.name)
+
+
 @benchmark.Enabled('android')  # catapult:#3176
 @benchmark.Owner(emails=['perezju@chromium.org'])
 class MemoryBenchmarkTop10Mobile(_MemoryInfra):