[tracing] Don't register tracing-related allocations.

third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp

 // 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 "platform/heap/BlinkGCMemoryDumpProvider.h"
 
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/heap_profiler_allocation_register.h"
 #include "base/trace_event/memory_allocator_dump.h"
 #include "base/trace_event/process_memory_dump.h"
@@ skipping 109 matching lines @@
 
 BlinkGCMemoryDumpProvider::BlinkGCMemoryDumpProvider()
     : m_currentProcessMemoryDump(new base::trace_event::ProcessMemoryDump(
           nullptr,
           {base::trace_event::MemoryDumpLevelOfDetail::DETAILED})),
       m_isHeapProfilingEnabled(false) {}
 
 void BlinkGCMemoryDumpProvider::insert(Address address,
                                        size_t size,
                                        const char* typeName) {
-  base::trace_event::AllocationContext context =
-      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
-          ->GetContextSnapshot();
+  base::trace_event::AllocationContext context;
+  if (!base::trace_event::AllocationContextTracker::
+           GetInstanceForCurrentThread()
+               ->GetContextSnapshot(&context))
+    return;
   context.type_name = typeName;
   MutexLocker locker(m_allocationRegisterMutex);
   if (m_allocationRegister)
     m_allocationRegister->Insert(address, size, context);
 }
 
 void BlinkGCMemoryDumpProvider::remove(Address address) {
   MutexLocker locker(m_allocationRegisterMutex);
   if (m_allocationRegister)
     m_allocationRegister->Remove(address);
 }
 
 }  // namespace blink