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

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index dce1d42e11d071384b5f9ee1dcaaa2b82446e791..1d9fd35237332cd74348bcb813eae4e4aa198388 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <stack>
 #include <string>
+#include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
@@ -40,6 +41,7 @@
 #include "cc/trees/single_thread_proxy.h"
 #include "cc/trees/thread_proxy.h"
 #include "cc/trees/tree_synchronizer.h"
+#include "ui/gfx/frame_time.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace {
@@ -1053,6 +1055,16 @@ void LayerTreeHost::PaintLayerContents(
           it->IsSuitableForGpuRasterization();
     }
 
+    if (*did_paint_content && it->smoothness_timing_requests().size()) {
+      const std::vector<std::pair<int64_t, gfx::Rect> >& vec =
+          it->smoothness_timing_requests();
+      std::pair<int, base::TimeTicks> timestamp(source_frame_number(),
+                                                gfx::FrameTime::Now());
+      for (size_t i = 0; i < vec.size(); ++i) {
+        client_->RecordCommitTiming(vec[i].first, timestamp);
+      }
+    }
+
     occlusion_tracker.LeaveLayer(it);
   }
 
@@ -1120,6 +1132,16 @@ void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
   }
 }
 
+void LayerTreeHost::RecordCompositeTiming(const CompositeTimingSet& info) {
+  if (!root_layer_.get())
+    return;
+
+  for (size_t i = 0; i < info.composites.size(); ++i) {
+    client_->RecordCompositeTiming(info.composites[i].rect_id,
+                                   info.composites[i].timestamps);
+  }
+}
+
 void LayerTreeHost::StartRateLimiter() {
   if (inside_begin_main_frame_)
     return;