memory-infra: Start disentangling tracing from memory-infra

base/trace_event/trace_log.cc

 // Copyright 2015 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 "base/trace_event/trace_log.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 #include <utility>
@@ skipping 737 matching lines @@
       observer->OnTraceLogDisabled();
     for (const auto& it : observer_map) {
       it.second.task_runner->PostTask(
           FROM_HERE, Bind(&AsyncEnabledStateObserver::OnTraceLogDisabled,
                           it.second.observer));
     }
   }
   dispatching_to_observer_list_ = false;
 }
 
+bool TraceLog::IsEnabled() {
+  return enabled_modes_ & RECORDING_MODE;
+}

[hjd, 2017/04/13 14:16:59]

Can't be inline if IsEnabled is virtual.

+
 int TraceLog::GetNumTracesRecorded() {
   AutoLock lock(lock_);
   if (!IsEnabled())
     return -1;
   return num_traces_recorded_;
 }
 
 void TraceLog::AddEnabledStateObserver(EnabledStateObserver* listener) {
   AutoLock lock(lock_);
   enabled_state_observer_list_.push_back(listener);
@@ skipping 965 matching lines @@
 }
 
 ScopedTraceBinaryEfficient::~ScopedTraceBinaryEfficient() {
   if (*category_group_enabled_) {
     TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_group_enabled_, name_,
                                                 event_handle_);
   }
 }
 
 }  // namespace trace_event_internal