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

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index d82a99cfebfc5e4e90c4076191d1cb80f1e95e4d..ed8c6ed7a4ce6be0bde253d64e1f1f1e8873a6c3 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -795,6 +795,32 @@ void RenderWidgetCompositor::ApplyViewportDeltas(
       top_controls_delta);
 }
 
+static std::pair<int, double> TickToDouble(
+    const std::pair<int, const base::TimeTicks>& tick) {
+  return std::make_pair(tick.first,
+                        (tick.second - base::TimeTicks()).InSecondsF());
+}
+
+void RenderWidgetCompositor::RecordCommitTiming(
+    int64_t rect_id,
+    const std::pair<int, base::TimeTicks>& commit) {
+  std::vector<std::pair<int, double> > commitTiming(1);
+  commitTiming[0] = TickToDouble(commit);
+  widget_->webwidget()->recordSmoothnessTimingEvent(
+      blink::WebWidget::CommitEvent, rect_id, commitTiming);
+}
+void RenderWidgetCompositor::RecordCompositeTiming(
+    int64_t rect_id,
+    const std::vector<std::pair<int, base::TimeTicks> >& composites) {
+  std::vector<std::pair<int, double> > compositeTiming(composites.size());
+  std::transform(composites.begin(),
+                 composites.end(),
+                 compositeTiming.begin(),
+                 TickToDouble);
+  widget_->webwidget()->recordSmoothnessTimingEvent(
+      blink::WebWidget::CompositeEvent, rect_id, compositeTiming);
+}
+
 scoped_ptr<cc::OutputSurface> RenderWidgetCompositor::CreateOutputSurface(
     bool fallback) {
   return widget_->CreateOutputSurface(fallback);