[not for review] Add Draw entries to window Performance Timeline

cc/debug/performance_draw_timing_counter.cc

+// 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.
+
+#include "cc/debug/performance_draw_timing_counter.h"
+
+#include <algorithm>
+#include <limits>
+
+#include "base/metrics/histogram.h"
+#include "cc/trees/proxy.h"
+
+namespace cc {
+
+// static
+scoped_ptr<PerformanceDrawTimingCounter>
+PerformanceDrawTimingCounter::Create() {
+  return make_scoped_ptr(new PerformanceDrawTimingCounter);
+}
+
+PerformanceDrawTimingCounter::PerformanceDrawTimingCounter() {
+}
+
+void PerformanceDrawTimingCounter::SaveTimeStamp(int frame_id, int64_t rect_id,
+                                                 base::TimeTicks timestamp) {
+  struct DrawEvent drawEvent(frame_id, rect_id, timestamp);
+  ring_buffer_.SaveToBuffer(drawEvent);
+}
+
+void PerformanceDrawTimingCounter::SaveTimeStamps(base::TimeTicks timestamp,
+    const std::vector<std::pair<int, int64_t> > &frame_ids) {
+  for (std::vector<std::pair<int, int64_t> >::const_iterator it =
+           frame_ids.begin(); it != frame_ids.end(); ++it) {
+    struct DrawEvent drawEvent(it->first, it->second, timestamp);

[enne (OOO), 2014/07/22 20:44:24]

style nit: draw_event, no struct

bikeshed: Maybe call this DrawTimingEvent for consistency?

[Mike B, 2014/07/25 23:09:40]

Done.

+    ring_buffer_.SaveToBuffer(drawEvent);
+  }
+}
+
+scoped_ptr<DrawTimingSet> PerformanceDrawTimingCounter::getDrawTimingCounts() {
+  typedef base::hash_map
+      <int64_t, std::vector<std::pair<int, base::TimeTicks> > > DrawsByRectId;
+  DrawsByRectId id_map;
+  for (RingBufferType::Iterator it = begin(); it; ++it) {
+    id_map[it->rect_id_].push_back(std::make_pair(it->frame_id_,
+                                                  it->timestamp_));
+  }
+  scoped_ptr<DrawTimingSet> draws_info(new DrawTimingSet);
+  for (DrawsByRectId::iterator id = id_map.begin(); id != id_map.end(); ++id) {
+    LayerTreeHostCommon::DrawTimingInfo draw;
+    draw.rect_id = id->first;
+    draw.timestamps = id->second;
+    std::sort(draw.timestamps.begin(), draw.timestamps.end());
+    draws_info->draws.push_back(draw);
+  }
+  return draws_info.Pass();
+}
+
+}  // namespace cc