Telemtry: hooks "chrome.gpuBenchmarking.smoothScrollBy" with java on android.

content/port/browser/smooth_scroll_gesture.cc

Index: content/port/browser/smooth_scroll_gesture.cc
diff --git a/content/port/browser/smooth_scroll_gesture.cc b/content/port/browser/smooth_scroll_gesture.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b783fc0a75cdd4fdaa995d058e5bc51c84c718a3
--- /dev/null
+++ b/content/port/browser/smooth_scroll_gesture.cc
@@ -0,0 +1,22 @@
+// Copyright (c) 2012 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/port/browser/smooth_scroll_gesture.h"
+
+namespace content {
+
+double SmoothScrollGesture::Tick(
+    base::TimeTicks now, double desired_interval_ms) {
+  double position_delta = 10;
+  if (!last_tick_time_.is_null()) {
+    double velocity = 10 / desired_interval_ms;
+    double time_delta = (now - last_tick_time_).InMillisecondsF();
+    position_delta = velocity * time_delta;
+  }
+
+  last_tick_time_ = now;
+  return position_delta;
+}
+
+}  // namespace content