[tracing] Add thread name to the pseudo stack of heap profiler

base/trace_event/heap_profiler_allocation_context_tracker.h

Index: base/trace_event/heap_profiler_allocation_context_tracker.h
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker.h b/base/trace_event/heap_profiler_allocation_context_tracker.h
index 20a6e3015d647aaad1272e3c36cc03e93d2c8eb6..21c3c97f9d377d3f332343a10f725390fd11599b 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker.h
+++ b/base/trace_event/heap_profiler_allocation_context_tracker.h
@@ -48,6 +48,10 @@ class BASE_EXPORT AllocationContextTracker {
   // returns nullptr in the nested calls.
   static AllocationContextTracker* GetInstanceForCurrentThread();
 
+  // Set the thread name in the AllocationContextTracker of the current thread
+  // if capture is enabled.
+  static void SetCurrentThreadName(const char* name);
+
   // Pushes a frame onto the thread-local pseudo stack.
   void PushPseudoStackFrame(StackFrame frame);
 
@@ -67,6 +71,9 @@ class BASE_EXPORT AllocationContextTracker {
   // The pseudo stack where frames are |TRACE_EVENT| names.
   std::vector<StackFrame> pseudo_stack_;
 
+  // The thread name is used as the first entry in the pseudo stack.
+  const char* thread_name_;
+
   DISALLOW_COPY_AND_ASSIGN(AllocationContextTracker);
 };