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

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index bbefaa0ca59d34162a272759ddab58cf9e041b05..ce2fdf2032259bcd17b48c5fe13b289f4f71c178 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -25,6 +25,7 @@
 #include "chrome/common/pepper_flash.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/secure_origin_whitelist.h"
+#include "chrome/common/trace_event_args_whitelist.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/common_resources.h"
 #include "components/dom_distiller/core/url_constants.h"
@@ -561,3 +562,8 @@ void ChromeContentClient::AddSecureSchemesAndOrigins(
   schemes->insert(extensions::kExtensionResourceScheme);
   GetSecureOriginWhitelist(origins);
 }
+
+base::trace_event::TraceEvent::EventFilterPredicate
+ChromeContentClient::GetTraceEventFilterPredicate() const {
+  return base::Bind(&chrome::IsTraceEventArgsWhitelisted);
+}