1 files changed, 51 insertions, 0 deletions
diff --git a/chromium/cc/debug/paint_time_counter.cc b/chromium/cc/debug/paint_time_counter.cc
new file mode 100644
index 00000000000..7d5415427ff
--- /dev/null
+++ b/chromium/cc/debug/paint_time_counter.cc
@@ -0,0 +1,51 @@
+// Copyright 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 "cc/debug/paint_time_counter.h"
+
+namespace cc {
+
+// static
+scoped_ptr<PaintTimeCounter> PaintTimeCounter::Create() {
+  return make_scoped_ptr(new PaintTimeCounter());
+}
+
+PaintTimeCounter::PaintTimeCounter()
+  : can_save_paint_time_delta_(false) {
+}
+
+void PaintTimeCounter::SavePaintTime(const base::TimeDelta& total_paint_time) {
+  if (can_save_paint_time_delta_) {
+    base::TimeDelta paint_time = total_paint_time - last_total_paint_time_;
+    ring_buffer_.SaveToBuffer(paint_time);
+  }
+
+  last_total_paint_time_ = total_paint_time;
+  can_save_paint_time_delta_ = true;
+}
+
+void PaintTimeCounter::GetMinAndMaxPaintTime(base::TimeDelta* min,
+                                             base::TimeDelta* max) const {
+  *min = base::TimeDelta::FromDays(1);
+  *max = base::TimeDelta();
+
+  for (RingBufferType::Iterator it = ring_buffer_.Begin(); it; ++it) {
+    const base::TimeDelta paint_time = **it;
+
+    if (paint_time < *min)
+      *min = paint_time;
+    if (paint_time > *max)
+      *max = paint_time;
+  }
+
+  if (*min > *max)
+    *min = *max;
+}
+
+void PaintTimeCounter::ClearHistory() {
+  ring_buffer_.Clear();
+  can_save_paint_time_delta_ = false;
+}
+
+}  // namespace cc