Expose synthetic delays through the GPU benchmarking extension

components/tracing/child_trace_message_filter.cc

Index: components/tracing/child_trace_message_filter.cc
diff --git a/components/tracing/child_trace_message_filter.cc b/components/tracing/child_trace_message_filter.cc
index 8a0e414c088b8e8f9adc643b3a54bb1e2560185b..c779de43328ed03caa3b49874d61ea8820a39e8c 100644
--- a/components/tracing/child_trace_message_filter.cc
+++ b/components/tracing/child_trace_message_filter.cc
@@ -42,6 +42,8 @@ bool ChildTraceMessageFilter::OnMessageReceived(const IPC::Message& message) {
                         OnGetTraceBufferPercentFull)
     IPC_MESSAGE_HANDLER(TracingMsg_SetWatchEvent, OnSetWatchEvent)
     IPC_MESSAGE_HANDLER(TracingMsg_CancelWatchEvent, OnCancelWatchEvent)
+    IPC_MESSAGE_HANDLER(TracingMsg_ConfigureSyntheticDelay,
+                        OnConfigureSyntheticDelay)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -118,6 +120,15 @@ void ChildTraceMessageFilter::OnCancelWatchEvent() {
   TraceLog::GetInstance()->CancelWatchEvent();
 }
 
+void ChildTraceMessageFilter::OnConfigureSyntheticDelay(
+    const TracingMsg_ConfigureSyntheticDelay_Params& params) {
+  base::debug::TraceEventSyntheticDelay* delay =
+      base::debug::TraceEventSyntheticDelay::Lookup(params.name);
+  delay->SetTargetDuration(params.target_duration);
+  delay->SetMode(params.mode);
+  channel_->Send(new TracingHostMsg_ConfigureSyntheticDelayAck());
+}
+
 void ChildTraceMessageFilter::OnTraceDataCollected(
     const scoped_refptr<base::RefCountedString>& events_str_ptr,
     bool has_more_events) {