Reland of [tracing] Add native allocation tracing mode.

base/trace_event/heap_profiler.h

 // Copyright 2016 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.
 
 #ifndef BASE_TRACE_EVENT_HEAP_PROFILER_H
 #define BASE_TRACE_EVENT_HEAP_PROFILER_H
 
 #include "base/compiler_specific.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 
@@ skipping 15 matching lines @@
 // tracing from the heap profiler dumps.
 #define HEAP_PROFILER_SCOPED_IGNORE                                          \
   trace_event_internal::HeapProfilerScopedIgnore INTERNAL_HEAP_PROFILER_UID( \
       scoped_ignore)
 
 namespace trace_event_internal {
 
 class BASE_EXPORT HeapProfilerScopedIgnore {
  public:
   inline HeapProfilerScopedIgnore() {
+    using base::trace_event::AllocationContextTracker;
     if (UNLIKELY(
-            base::trace_event::AllocationContextTracker::capture_enabled())) {
-      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
+            AllocationContextTracker::capture_mode() !=
+            AllocationContextTracker::CaptureMode::DISABLED)) {
+      AllocationContextTracker::GetInstanceForCurrentThread()
           ->begin_ignore_scope();
     }
   }
   inline ~HeapProfilerScopedIgnore() {
+    using base::trace_event::AllocationContextTracker;
     if (UNLIKELY(
-            base::trace_event::AllocationContextTracker::capture_enabled())) {
-      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
+            AllocationContextTracker::capture_mode() !=
+            AllocationContextTracker::CaptureMode::DISABLED)) {
+      AllocationContextTracker::GetInstanceForCurrentThread()
           ->end_ignore_scope();
     }
   }
 };
 
 }  // namespace trace_event_internal
 
 #endif  // BASE_TRACE_EVENT_HEAP_PROFILER_H