Add WebView startup time benchmark

tools/perf/benchmarks/system_health.py

Index: tools/perf/benchmarks/system_health.py
diff --git a/tools/perf/benchmarks/system_health.py b/tools/perf/benchmarks/system_health.py
index 598ff82909401a4a9cc4b2a624cb84567c069a48..9997a946b39f86aa1f4100a5908d7e5b04c9dfb2 100644
--- a/tools/perf/benchmarks/system_health.py
+++ b/tools/perf/benchmarks/system_health.py
@@ -38,8 +38,10 @@ class SystemHealthTop25(_SystemHealthBenchmark):
   def Name(cls):
     return 'system_health.top25'
 
+
 @benchmark.Disabled('android')  # crbug.com/601953
 @benchmark.Disabled('all')  # crbug.com/613050
+
 class SystemHealthKeyMobileSites(_SystemHealthBenchmark):
   page_set = page_sets.KeyMobileSitesPageSet
 
@@ -73,6 +75,24 @@ class _MemorySystemHealthBenchmark(perf_benchmark.PerfBenchmark):
   def Name(cls):
     return 'system_health.memory_%s' % cls.page_set.PLATFORM
 
+
+@benchmark.Enabled('android')
+class WebviewStartupSystemHealthBenchmark(_SystemHealthBenchmark):
+  """Chrome Webview Startup Time system health Benchmark. """

[charliea (OOO until 10-5), 2016/06/06 19:52:53]

nit: system health should be capitalized (like above)

[charliea (OOO until 10-5), 2016/06/06 19:52:53]

nit: I think that we want to add more context to this pydoc. 

What is the "Chrome Webview Startup Time system health Benchmark"? What's the
purpose of it? A sentence or two of context would be good. (the memory benchmark
provides a link to the doc, but if we can do something inline, I think that's
preferable)

[charliea (OOO until 10-5), 2016/06/06 19:52:53]

nit: delete trailing space

[alexandermont, 2016/06/06 23:30:16]

Done

+  page_set = page_sets.BlankPageSet
+  def CreateTimelineBasedMeasurementOptions(self):
+    options = timeline_based_measurement.Options(
+        tracing_category_filter.TracingCategoryFilter())
+    options.SetTimelineBasedMetric('webviewStartupMetric')
+    options.config.enable_atrace_trace = True
+    options.config.enable_chrome_trace = False
+    options.config.atrace_app_name = 'org.chromium.webview_shell'
+    return options
+
+  @classmethod
+  def Name(cls):
+    return 'system_health.webview_startup'
+
 # https://github.com/catapult-project/catapult/issues/2340
 @benchmark.Disabled('all')
 class DesktopMemorySystemHealth(_MemorySystemHealthBenchmark):