[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 07264322ef8285c6c0b9b57803cea3e90e7df709..89768502c62016d66162f267c3e92f92801b71c0 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -14,6 +14,7 @@
 #include "cc/base/swap_promise.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/debug/devtools_instrumentation.h"
+#include "cc/debug/performance_draw_timing_counter.h"
 #include "cc/input/input_handler.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface.h"
@@ -720,6 +721,10 @@ 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->draw_info =
+      impl().layer_tree_host_impl->draw_counter()->getDrawTimingCounts();
+  impl().layer_tree_host_impl->draw_counter()->clearEvents();
+
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::BeginMainFrame,
@@ -791,6 +796,8 @@ void ThreadProxy::BeginMainFrame(
 
   layer_tree_host()->ApplyScrollAndScale(*begin_main_frame_state->scroll_info);
 
+  layer_tree_host()->RecordDrawTiming(*begin_main_frame_state->draw_info);
+
   layer_tree_host()->WillBeginMainFrame();
 
   layer_tree_host()->UpdateClientAnimations(