Add support for latency measurement to Telemetry smoothness benchmarks.

content/common/browser_rendering_stats.cc

Index: content/common/browser_rendering_stats.cc
diff --git a/content/common/browser_rendering_stats.cc b/content/common/browser_rendering_stats.cc
new file mode 100644
index 0000000000000000000000000000000000000000..48a801305fba92f3a4607c31b1a4fef064eaf2a0
--- /dev/null
+++ b/content/common/browser_rendering_stats.cc
@@ -0,0 +1,19 @@
+// Copyright (c) 2013 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.
+
+#include "content/common/browser_rendering_stats.h"
+
+namespace content {
+
+BrowserRenderingStats::BrowserRenderingStats() : input_event_count(0) {}
+
+BrowserRenderingStats::~BrowserRenderingStats() {}
+
+void BrowserRenderingStats::EnumerateFields(
+    cc::RenderingStats::Enumerator* enumerator) const {
+  enumerator->AddInt("inputEventCount", input_event_count);
+  enumerator->AddTimeDeltaInSecondsF("totalInputLatency", total_input_latency);
+}
+
+}  // namespace content