Ensure Origin Thread Affinity for BlameContext

base/trace_event/blame_context.h

Index: base/trace_event/blame_context.h
diff --git a/base/trace_event/blame_context.h b/base/trace_event/blame_context.h
index 81c35afc8b932e0533874dbf43beae418817e6d2..7aa436acb2362d14ad42db3b08188d10db8f6081 100644
--- a/base/trace_event/blame_context.h
+++ b/base/trace_event/blame_context.h
@@ -9,6 +9,7 @@
 
 #include "base/base_export.h"
 #include "base/macros.h"
+#include "base/threading/thread_checker.h"
 #include "base/trace_event/trace_log.h"
 
 namespace base {
@@ -120,6 +121,10 @@ class BASE_EXPORT BlameContext
 
   const unsigned char* category_group_enabled_;
 
+  ThreadChecker thread_checker_;
+  scoped_refptr<SingleThreadTaskRunner> task_runner_;
+  WeakPtrFactory<BlameContext> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BlameContext);
 };