CL for perf tryjob on android

tools/perf/measurements/page_cycler.py

Index: tools/perf/measurements/page_cycler.py
diff --git a/tools/perf/measurements/page_cycler.py b/tools/perf/measurements/page_cycler.py
index 3457aaa1b9877ce816f1c716a3dfffa43c2cee3b..28f0c3b58b099485807f503dc7436bb8b46e4b4f 100644
--- a/tools/perf/measurements/page_cycler.py
+++ b/tools/perf/measurements/page_cycler.py
@@ -28,6 +28,9 @@ from metrics import memory
 from metrics import power
 from metrics import speedindex
 
+from telemetry.timeline import tracing_config
+from telemetry.timeline import tracing_category_filter
+
 
 class PageCycler(page_test.PageTest):
 
@@ -75,6 +78,11 @@ class PageCycler(page_test.PageTest):
     self._cpu_metric = cpu.CpuMetric(browser)
 
   def WillNavigateToPage(self, page, tab):
+    category_filter = tracing_category_filter.TracingCategoryFilter(
+        'blink.user_timing')
+    config = tracing_config.TracingConfig()
+    config.SetTracingCategoryFilter(category_filter)
+    tab.browser.platform.tracing_controller.StartTracing(config)
     if page.is_file:
       # For legacy page cyclers which use the filesystem, do an initial
       # navigate to avoid paying for a cross-renderer navigation.
@@ -122,6 +130,7 @@ class PageCycler(page_test.PageTest):
 
     self._has_loaded_page[page.url] += 1
 
+    tab.browser.platform.tracing_controller.StopTracing()
     self._power_metric.Stop(page, tab)
     self._memory_metric.Stop(page, tab)
     self._memory_metric.AddResults(tab, results)