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

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

Index: third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
diff --git a/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp b/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
index b4f686dfac6f30a21aff8281d7e3c87bd11eb225..65ef5dee4f06439b05f7b8ab8dcdd65af40863d2 100644
--- a/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
+++ b/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
@@ -127,9 +127,11 @@ BlinkGCMemoryDumpProvider::BlinkGCMemoryDumpProvider()
 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)