Revert of telemetry: Clean up SurfaceFlinger statistics

tools/telemetry/telemetry/web_perf/metrics/rendering_stats.py

Index: tools/telemetry/telemetry/web_perf/metrics/rendering_stats.py
diff --git a/tools/telemetry/telemetry/web_perf/metrics/rendering_stats.py b/tools/telemetry/telemetry/web_perf/metrics/rendering_stats.py
index 5f9278d5ccfc98efcd9bf2f930e83fd57619ae4f..2dd9819b70c8a3daecb3c0318e4b5f46974ef066 100644
--- a/tools/telemetry/telemetry/web_perf/metrics/rendering_stats.py
+++ b/tools/telemetry/telemetry/web_perf/metrics/rendering_stats.py
@@ -108,19 +108,14 @@
 
 def GetTimestampEventName(process):
   """ Returns the name of the events used to count frame timestamps. """
-  if process.name == 'SurfaceFlinger':
-    return 'vsync_before'
-
   event_name = 'BenchmarkInstrumentation::DisplayRenderingStats'
   for event in process.IterAllSlicesOfName(event_name):
     if 'data' in event.args and event.args['data']['frame_count'] == 1:
       return event_name
-
   return 'BenchmarkInstrumentation::ImplThreadRenderingStats'
 
 class RenderingStats(object):
-  def __init__(self, renderer_process, browser_process, surface_flinger_process,
-               timeline_ranges):
+  def __init__(self, renderer_process, browser_process, timeline_ranges):
     """
     Utility class for extracting rendering statistics from the timeline (or
     other loggin facilities), and providing them in a common format to classes
@@ -132,13 +127,8 @@
     All *_time values are measured in milliseconds.
     """
     assert len(timeline_ranges) > 0
-    self.refresh_period = None
-
     # Find the top level process with rendering stats (browser or renderer).
-    if surface_flinger_process:
-      timestamp_process = surface_flinger_process
-      self._GetRefreshPeriodFromSurfaceFlingerProcess(surface_flinger_process)
-    elif HasRenderingStats(browser_process):
+    if HasRenderingStats(browser_process):
       timestamp_process = browser_process
     else:
       timestamp_process = renderer_process
@@ -180,11 +170,6 @@
           browser_process, renderer_process, timeline_range)
       self._InitFrameQueueingDurationsFromTimeline(
           renderer_process, timeline_range)
-
-  def _GetRefreshPeriodFromSurfaceFlingerProcess(self, surface_flinger_process):
-    for event in surface_flinger_process.IterAllEventsOfName('vsync_before'):
-      self.refresh_period = event.args['data']['refresh_period']
-      return
 
   def _InitInputLatencyStatsFromTimeline(
       self, browser_process, renderer_process, timeline_range):