Expose TickSample and its APIs in v8-profiler.h

src/profiler/cpu-profiler-inl.h

Index: src/profiler/cpu-profiler-inl.h
diff --git a/src/profiler/cpu-profiler-inl.h b/src/profiler/cpu-profiler-inl.h
index d8c9c909c292390b9a288a1812824115cc4ec6c4..50acb76a33b2c4ed69e865776fd1d0223a561790 100644
--- a/src/profiler/cpu-profiler-inl.h
+++ b/src/profiler/cpu-profiler-inl.h
@@ -71,6 +71,10 @@ TickSample* ProfilerEventsProcessor::StartTickSample() {
 
 
 void ProfilerEventsProcessor::FinishTickSample() {
+  TickSampleEventRecord* evt = ticks_buffer_.CurrentEnqueue();
+  evt->timestamp = evt->sample.pc == nullptr
+                       ? base::TimeTicks()
+                       : base::TimeTicks::HighResolutionNow();
   ticks_buffer_.FinishEnqueue();
 }