1 files changed, 22 insertions, 0 deletions
diff --git a/catapult/telemetry/telemetry/web_perf/metrics/layout.py b/catapult/telemetry/telemetry/web_perf/metrics/layout.py
new file mode 100644
index 00000000..fb1c5f24
--- /dev/null
+++ b/catapult/telemetry/telemetry/web_perf/metrics/layout.py
@@ -0,0 +1,22 @@
+# 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.
+
+from telemetry.web_perf.metrics import single_event
+
+EVENT_NAME = 'FrameView::performLayout'
+METRIC_NAME = 'layout'
+
+class LayoutMetric(single_event._SingleEventMetric):
+  """Reports directly durations of FrameView::performLayout events.
+
+    layout: Durations of FrameView::performLayout events that were caused by and
+            start during user interaction.
+
+  Layout happens no more than once per frame, so per-frame-ness is implied.
+  """
+
+  def __init__(self):
+    super(LayoutMetric, self).__init__(EVENT_NAME, METRIC_NAME,
+        metric_description=('List of durations of layouts that were caused by '
+                            'and start during interactions'))