Expose synthetic delays through the GPU benchmarking extension

content/public/browser/tracing_controller.h

Index: content/public/browser/tracing_controller.h
diff --git a/content/public/browser/tracing_controller.h b/content/public/browser/tracing_controller.h
index ae46199d2b9d55d7eec35bbf2abb74bab194d9f5..3353089dab4fb4e7d926959d03575f331109d6d1 100644
--- a/content/public/browser/tracing_controller.h
+++ b/content/public/browser/tracing_controller.h
@@ -8,6 +8,7 @@
 #include <set>
 
 #include "base/debug/trace_event.h"
+#include "base/debug/trace_event_synthetic_delay.h"
 #include "content/common/content_export.h"
 
 namespace base {
@@ -146,6 +147,17 @@ class TracingController {
   virtual bool GetTraceBufferPercentFull(
       const GetTraceBufferPercentFullCallback& callback) = 0;
 
+  // Configure a synthetic delay for all processes.
+  //
+  // Once all child processes have acked the delay configuration,
+  // ConfigureSyntheticDelayCallback is called back.
+  typedef base::Callback<void()> ConfigureSyntheticDelayCallback;
+  virtual void ConfigureSyntheticDelay(
+      const std::string& name,
+      base::TimeDelta target_duration,
+      base::debug::TraceEventSyntheticDelay::Mode mode,
+      const ConfigureSyntheticDelayCallback& callback) = 0;
+
  protected:
   virtual ~TracingController() {}
 };