Added a whitelist for trace events that are known to be PII-less.

base/trace_event/trace_event_impl_constants.cc

Index: base/trace_event/trace_event_impl_constants.cc
diff --git a/base/trace_event/trace_event_impl_constants.cc b/base/trace_event/trace_event_impl_constants.cc
index ffeacff38316c006eb0d70fb157838c3b7afb91d..930d52fc7712f90de3d9fefd95cd389fe292bacc 100644
--- a/base/trace_event/trace_event_impl_constants.cc
+++ b/base/trace_event/trace_event_impl_constants.cc
@@ -23,6 +23,8 @@ const TraceLog::InternalTraceOptions
     TraceLog::kInternalEchoToConsole = 1 << 3;
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalRecordAsMuchAsPossible = 1 << 4;
+const TraceLog::InternalTraceOptions
+    TraceLog::kInternalEnableArgumentFilter = 1 << 5;
 
 }  // namespace trace_event
 }  // namespace base