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

content/public/common/content_client.cc

Index: content/public/common/content_client.cc
diff --git a/content/public/common/content_client.cc b/content/public/common/content_client.cc
index 421a0a335407b9da54c9cd86518c3dcfda34714d..cb5934f1358fbd140abb547699dbe0ec88fac3cd 100644
--- a/content/public/common/content_client.cc
+++ b/content/public/common/content_client.cc
@@ -112,4 +112,10 @@ bool ContentClient::GetSandboxProfileForSandboxType(
 }
 #endif
 
+base::trace_event::TraceEvent::EventFilterPredicate
+ContentClient::GetTraceEventFilterPredicate() const {
+  NOTIMPLEMENTED();
+  return base::trace_event::TraceEvent::EventFilterPredicate();
+}
+
 }  // namespace content