Expose TickSample and its APIs in v8-profiler.h

src/profiler/cpu-profiler-inl.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PROFILER_CPU_PROFILER_INL_H_
 #define V8_PROFILER_CPU_PROFILER_INL_H_
 
 #include "src/profiler/cpu-profiler.h"
 
 #include <new>
@@ skipping 53 matching lines @@
 TickSample* ProfilerEventsProcessor::StartTickSample() {
   void* address = ticks_buffer_.StartEnqueue();
   if (address == NULL) return NULL;
   TickSampleEventRecord* evt =
       new (address) TickSampleEventRecord(last_code_event_id_.Value());
   return &evt->sample;
 }
 
 
 void ProfilerEventsProcessor::FinishTickSample() {
+  TickSampleEventRecord* evt = ticks_buffer_.CurrentEnqueue();
+  evt->timestamp = evt->sample.pc == nullptr
+                       ? base::TimeTicks()
+                       : base::TimeTicks::HighResolutionNow();
   ticks_buffer_.FinishEnqueue();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROFILER_CPU_PROFILER_INL_H_