Plumb activation time to main

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
index fe476ff8ad6e49f284c865eed04c4ecc92a8b6fd..cbd239acf515636c908cd4cc5e3834cf2f7e1e1d 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
@@ -405,6 +405,13 @@ void RendererSchedulerImpl::WillBeginFrame(const cc::BeginFrameArgs& args) {
   if (helper_.IsShutdown())
     return;
 
+  fprintf(stderr,
+          "\nRendererSchedulerImpl::WillBeginFrame: current frame: %d\n [",
+          args.frame_source_number);
+  for (auto activate_frame : args.ready_to_activate_time)
+    fprintf(stderr, "\tactivated frame: %d, activated time: %lu",
+            activate_frame.first, activate_frame.second.ToInternalValue());
+  fprintf(stderr, "\n ]");
   EndIdlePeriod();
   MainThreadOnly().estimated_next_frame_begin = args.frame_time + args.interval;
   MainThreadOnly().have_seen_a_begin_main_frame = true;