Let TRACE_EVENT_XXX_WITH_TIMESTAMP accept TimeTicks instead of int64_t

content/renderer/devtools/v8_sampling_profiler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/devtools/v8_sampling_profiler.h"
 
 #include <stdint.h>
 #include <string.h>
 
 #include "base/format_macros.h"
@@ skipping 285 matching lines @@
   record->Collect(isolate_, timestamp, state);
   samples_data_->FinishEnqueue();
 }
 
 void Sampler::InjectPendingEvents() {
   SampleRecord* record = samples_data_->Peek();
   while (record) {
     TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP1(
         TRACE_DISABLED_BY_DEFAULT("v8.cpu_profile"), "V8Sample",
         platform_data_.thread_id(),
-        (record->timestamp() - base::TimeTicks()).InMicroseconds(), "data",
-        record->ToTraceFormat());
+        record->timestamp(), "data", record->ToTraceFormat());
     samples_data_->Remove();
     record = samples_data_->Peek();
     base::subtle::NoBarrier_AtomicIncrement(&samples_count_, 1);
   }
 }
 
 // static
 void Sampler::InstallJitCodeEventHandler(Isolate* isolate, void* data) {
   // Called on the sampled V8 thread.
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.cpu_profile"),
@@ skipping 324 matching lines @@
   waitable_event_for_testing_.reset(
       new base::WaitableEvent(base::WaitableEvent::ResetPolicy::AUTOMATIC,
                               base::WaitableEvent::InitialState::NOT_SIGNALED));
 }
 
 void V8SamplingProfiler::WaitSamplingEventForTesting() {
   waitable_event_for_testing_->Wait();
 }
 
 }  // namespace content