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

cc/debug/smoothness_timing_tracker.cc

Index: cc/debug/smoothness_timing_tracker.cc
diff --git a/cc/debug/smoothness_timing_tracker.cc b/cc/debug/smoothness_timing_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e35238e59e7f2fc86e3a9934ccd02ee79ecb02c5
--- /dev/null
+++ b/cc/debug/smoothness_timing_tracker.cc
@@ -0,0 +1,57 @@
+// 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/smoothness_timing_tracker.h"
+
+#include <algorithm>
+#include <limits>
+
+#include "base/metrics/histogram.h"
+#include "cc/trees/proxy.h"
+
+namespace cc {
+
+// static
+scoped_ptr<SmoothnessTimingTracker> SmoothnessTimingTracker::Create() {
+  return make_scoped_ptr(new SmoothnessTimingTracker);
+}
+
+SmoothnessTimingTracker::SmoothnessTimingTracker() {
+}
+
+void SmoothnessTimingTracker::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) {
+    SmoothnessTimingCompositeEvent smoothness_timing_composite_event(
+        it->first, it->second, timestamp);
+    ring_buffer_.SaveToBuffer(smoothness_timing_composite_event);
+  }
+}
+
+scoped_ptr<CompositeTimingSet>
+SmoothnessTimingTracker::CalculateCompositeCounts() {
+  typedef base::hash_map<int64_t,
+                         std::vector<std::pair<int, base::TimeTicks> > >
+      TicksByRectId;
+  TicksByRectId 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<CompositeTimingSet> composite_info(new CompositeTimingSet);
+  for (TicksByRectId::iterator id = id_map.begin(); id != id_map.end(); ++id) {
+    LayerTreeHostCommon::CompositeTimingInfo composite;
+    composite.rect_id = id->first;
+    composite.timestamps = id->second;
+    std::sort(composite.timestamps.begin(), composite.timestamps.end());
+    composite_info->composites.push_back(composite);
+  }
+  return composite_info.Pass();
+}
+
+}  // namespace cc