Expose synthetic delays through the GPU benchmarking extension

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 7cd7c33f25e6cdde639dd4d063878ba529acddc5..184e2615ca2430b004bd56b4485538efc6df0388 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -621,6 +621,8 @@ bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(ViewMsg_Snapshot, OnSnapshot)
     IPC_MESSAGE_HANDLER(ViewMsg_SetBrowserRenderingStats,
                         OnSetBrowserRenderingStats)
+    IPC_MESSAGE_HANDLER(ViewMsg_ConfigureSyntheticDelayAck,
+                        OnConfigureSyntheticDelayAck)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -2730,6 +2732,26 @@ void RenderWidget::GetBrowserRenderingStats(BrowserRenderingStats* stats) {
   *stats = browser_rendering_stats_;
 }
 
+void RenderWidget::ConfigureSyntheticDelay(
+    const std::string& name,
+    base::TimeDelta target_duration,
+    base::debug::TraceEventSyntheticDelay::Mode mode,
+    const SyntheticDelayConfigurationCallback& callback) {
+  DCHECK(!callback.is_null());
+
+  ViewHostMsg_ConfigureSyntheticDelay_Params params;
+  params.name = name;
+  params.target_duration = target_duration;
+  params.mode = mode;
+
+  Send(new ViewHostMsg_ConfigureSyntheticDelay(routing_id_, params));
+  pending_delay_configuration_ = callback;
+}
+
+void RenderWidget::OnConfigureSyntheticDelayAck() {
+  pending_delay_configuration_.Run();
+}
+
 void RenderWidget::BeginSmoothScroll(
     bool down,
     const SyntheticGestureCompletionCallback& callback,