Expose synthetic delays through the GPU benchmarking extension

content/browser/tracing/trace_message_filter.cc

Index: content/browser/tracing/trace_message_filter.cc
diff --git a/content/browser/tracing/trace_message_filter.cc b/content/browser/tracing/trace_message_filter.cc
index 00fffb9900e2922711c794eda9e237a15a91ab9c..863af557ea070ab1a138efd7d5491815f1beb50e 100644
--- a/content/browser/tracing/trace_message_filter.cc
+++ b/content/browser/tracing/trace_message_filter.cc
@@ -14,7 +14,8 @@ TraceMessageFilter::TraceMessageFilter() :
     has_child_(false),
     is_awaiting_end_ack_(false),
     is_awaiting_capture_monitoring_snapshot_ack_(false),
-    is_awaiting_buffer_percent_full_ack_(false) {
+    is_awaiting_buffer_percent_full_ack_(false),
+    is_awaiting_configure_synthetic_delay_ack_(false) {
 }
 
 void TraceMessageFilter::OnChannelClosing() {
@@ -51,6 +52,8 @@ bool TraceMessageFilter::OnMessageReceived(const IPC::Message& message,
                         OnTraceNotification)
     IPC_MESSAGE_HANDLER(TracingHostMsg_TraceBufferPercentFullReply,
                         OnTraceBufferPercentFullReply)
+    IPC_MESSAGE_HANDLER(TracingHostMsg_ConfigureSyntheticDelayAck,
+                        OnConfigureSyntheticDelayAck)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
   return handled;
@@ -109,6 +112,20 @@ void TraceMessageFilter::SendCancelWatchEvent() {
   Send(new TracingMsg_CancelWatchEvent);
 }
 
+void TraceMessageFilter::SendConfigureSyntheticDelay(
+    const std::string& name,
+    base::TimeDelta target_duration,
+    base::debug::TraceEventSyntheticDelay::Mode mode) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!is_awaiting_configure_synthetic_delay_ack_);
+  TracingMsg_ConfigureSyntheticDelay_Params params;
+  params.name = name;
+  params.target_duration = target_duration;
+  params.mode = mode;
+  is_awaiting_configure_synthetic_delay_ack_ = true;
+  Send(new TracingMsg_ConfigureSyntheticDelay(params));
+}
+
 TraceMessageFilter::~TraceMessageFilter() {}
 
 void TraceMessageFilter::OnChildSupportsTracing() {
@@ -173,4 +190,13 @@ void TraceMessageFilter::OnTraceBufferPercentFullReply(float percent_full) {
   }
 }
 
+void TraceMessageFilter::OnConfigureSyntheticDelayAck() {
+  if (is_awaiting_configure_synthetic_delay_ack_) {
+    is_awaiting_configure_synthetic_delay_ack_ = false;
+    TracingControllerImpl::GetInstance()->OnConfigureSyntheticDelayAcked();
+  } else {
+    NOTREACHED();
+  }
+}
+
 }  // namespace content