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

third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp

Index: third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
diff --git a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
index 5b66c0b7c35b54614a22b720c0e92f03e1d7bace..b189b629ce84c39e3d4cd72da30c077858b77c32 100644
--- a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
+++ b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
@@ -200,9 +200,12 @@ void PartitionAllocMemoryDumpProvider::OnHeapProfilingEnabled(bool enabled) {
 void PartitionAllocMemoryDumpProvider::insert(void* 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)