Hooked the trace event argument whitelist up to the background_trace_manager

base/trace_event/trace_config.h

Index: base/trace_event/trace_config.h
diff --git a/base/trace_event/trace_config.h b/base/trace_event/trace_config.h
index fe23c172aa76291c01a15ca4222c067cc2440087..a9f830656203502852ba1ca25b77554bc1867220 100644
--- a/base/trace_event/trace_config.h
+++ b/base/trace_event/trace_config.h
@@ -122,6 +122,7 @@ class BASE_EXPORT TraceConfig {
   void SetTraceRecordMode(TraceRecordMode mode) { record_mode_ = mode; }
   void EnableSampling() { enable_sampling_ = true; }
   void EnableSystrace() { enable_systrace_ = true; }
+  void EnableArgumentFilter() { enable_argument_filter_ = true; }
 
   // Writes the string representation of the TraceConfig. The string is JSON
   // formatted.