[Tracing] Add metadata filter

content/browser/tracing/tracing_controller_impl.cc

Index: content/browser/tracing/tracing_controller_impl.cc
diff --git a/content/browser/tracing/tracing_controller_impl.cc b/content/browser/tracing/tracing_controller_impl.cc
index 13a5333fe5a642659586045f42420e0b4ed51aad..bc2eb6ea2f6d08911a05027ac525673e46d70562 100644
--- a/content/browser/tracing/tracing_controller_impl.cc
+++ b/content/browser/tracing/tracing_controller_impl.cc
@@ -284,8 +284,18 @@ bool TracingControllerImpl::StopTracing(
     const scoped_refptr<TraceDataSink>& trace_data_sink) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
-  if (trace_data_sink)
+  if (trace_data_sink) {
+    if (TraceLog::GetInstance()->GetCurrentTraceConfig()
+        .IsArgumentFilterEnabled()) {
+      scoped_ptr<TracingDelegate> delegate(
+          GetContentClient()->browser()->GetTracingDelegate());
+      if (delegate) {
+        trace_data_sink->SetMetadataFilterPredicate(
+            delegate->GetMetadataFilterPredicate());
+      }
+    }
     trace_data_sink->AddMetadata(*GenerateTracingMetadataDict().get());
+  }
 
   if (!can_stop_tracing())
     return false;