telemetry: Clean up SurfaceFlinger statistics

tools/telemetry/telemetry/timeline/surface_flinger_timeline_data.py

Index: tools/telemetry/telemetry/timeline/surface_flinger_timeline_data.py
diff --git a/tools/telemetry/telemetry/timeline/surface_flinger_timeline_data.py b/tools/telemetry/telemetry/timeline/surface_flinger_timeline_data.py
new file mode 100644
index 0000000000000000000000000000000000000000..5461db5bda18792fae1737a4c719f522e4fb8ea6
--- /dev/null
+++ b/tools/telemetry/telemetry/timeline/surface_flinger_timeline_data.py
@@ -0,0 +1,29 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import json
+
+from telemetry.timeline.timeline_data import TimelineData
+
+
+class SurfaceFlingerTimelineData(TimelineData):
+  def __init__(self, pid, refresh_period, timestamps):
+    super(SurfaceFlingerTimelineData, self).__init__()
+    self._events = []
+    for ts in timestamps:
+      self._events.append(
+        {'cat': 'SurfaceFlinger',
+         'name': 'vsync_before',
+         'ts': ts,
+         'pid': pid,
+         'tid': pid,
+         'args': {'data': {'frame_count': 1,
+                           'refresh_period': refresh_period}}})
+
+  def Serialize(self, f):
+    """Serializes the surface flinger data to a file-like object"""
+    json.dump(self._events, f, indent=4)
+
+  def EventData(self):
+    return self._events