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

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 6481a4d1106837eeb78f2c432689b2273f601e91..2ced4b1badd5231f3356f7174ed26e9402210d0b 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -15,6 +15,7 @@
 #include "cc/base/swap_promise.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/debug/devtools_instrumentation.h"
+#include "cc/debug/smoothness_timing_tracker.h"
 #include "cc/input/input_handler.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface.h"
@@ -704,6 +705,12 @@ void ThreadProxy::ScheduledActionSendBeginMainFrame() {
       impl().layer_tree_host_impl->memory_allocation_priority_cutoff();
   begin_main_frame_state->evicted_ui_resources =
       impl().layer_tree_host_impl->EvictedUIResourcesExist();
+  begin_main_frame_state->smoothness_composite_counts =
+      impl()
+          .layer_tree_host_impl->smoothness_tracker()
+          ->CalculateCompositeCounts();
+  impl().layer_tree_host_impl->smoothness_tracker()->clear_events();
+
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::BeginMainFrame,
@@ -782,6 +789,9 @@ void ThreadProxy::BeginMainFrame(
   layer_tree_host()->ApplyScrollAndScale(
       begin_main_frame_state->scroll_info.get());
 
+  layer_tree_host()->RecordCompositeTiming(
+      *begin_main_frame_state->smoothness_composite_counts);
+
   layer_tree_host()->WillBeginMainFrame();
 
   layer_tree_host()->BeginMainFrame(begin_main_frame_state->begin_frame_args);