Reland [Tracing] V8 Tracing Controller

src/libplatform/tracing/trace-object.cc

+// Copyright 2016 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.
+
+#include "include/libplatform/v8-tracing.h"
+
+#include "src/base/platform/platform.h"
+#include "src/base/platform/time.h"
+
+namespace v8 {
+namespace platform {
+namespace tracing {
+
+void TraceObject::Initialize(char phase, const uint8_t* category_enabled_flag,
+                             const char* name, const char* scope, uint64_t id,
+                             uint64_t bind_id, int num_args,
+                             const char** arg_names, const uint8_t* arg_types,
+                             const uint64_t* arg_values, unsigned int flags) {
+  pid_ = base::OS::GetCurrentProcessId();
+  tid_ = base::OS::GetCurrentThreadId();
+  phase_ = phase;
+  category_enabled_flag_ = category_enabled_flag;
+  name_ = name;
+  scope_ = scope;
+  id_ = id;
+  bind_id_ = bind_id;
+  num_args_ = num_args;
+  flags_ = flags;
+  ts_ = base::TimeTicks::HighResolutionNow().ToInternalValue();
+  tts_ = base::ThreadTicks::Now().ToInternalValue();
+  duration_ = 0;
+  cpu_duration_ = 0;
+}
+
+void TraceObject::UpdateDuration() {
+  duration_ = base::TimeTicks::HighResolutionNow().ToInternalValue() - ts_;
+  cpu_duration_ = base::ThreadTicks::Now().ToInternalValue() - tts_;
+}
+
+void TraceObject::InitializeForTesting(
+    char phase, const uint8_t* category_enabled_flag, const char* name,
+    const char* scope, uint64_t id, uint64_t bind_id, int num_args,
+    const char** arg_names, const uint8_t* arg_types,
+    const uint64_t* arg_values, unsigned int flags, int pid, int tid,
+    int64_t ts, int64_t tts, uint64_t duration, uint64_t cpu_duration) {
+  pid_ = pid;
+  tid_ = tid;
+  phase_ = phase;
+  category_enabled_flag_ = category_enabled_flag;
+  name_ = name;
+  scope_ = scope;
+  id_ = id;
+  bind_id_ = bind_id;
+  num_args_ = num_args;
+  flags_ = flags;
+  ts_ = ts;
+  tts_ = tts;
+  duration_ = duration;
+  cpu_duration_ = cpu_duration;
+}
+
+}  // namespace tracing
+}  // namespace platform
+}  // namespace v8