Expose synthetic delays through the GPU benchmarking extension

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 9a260470721c121759982b09b36c78f14b340c69..6b5745117fa5352e77b5e50b6502209676df6e95 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/debug/trace_event_synthetic_delay.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
@@ -198,6 +199,15 @@ class CONTENT_EXPORT RenderWidget
                   int anchor_y,
                   const SyntheticGestureCompletionCallback& callback);
 
+  // Configure a synthetic delay across all processes. Once all processes have
+  // acknowledged the new delay configuration, |callback| will be called back.
+  typedef base::Callback<void()> SyntheticDelayConfigurationCallback;
+  void ConfigureSyntheticDelay(
+      const std::string& name,
+      base::TimeDelta target_duration,
+      base::debug::TraceEventSyntheticDelay::Mode mode,
+      const SyntheticDelayConfigurationCallback& callback);
+
   // Close the underlying WebWidget.
   virtual void Close();
 
@@ -358,6 +368,7 @@ class CONTENT_EXPORT RenderWidget
                      const gfx::Size& desired_size);
   void OnRepaint(gfx::Size size_to_paint);
   void OnSyntheticGestureCompleted();
+  void OnConfigureSyntheticDelayAck();
   void OnSetTextDirection(blink::WebTextDirection direction);
   void OnGetFPS();
   void OnUpdateScreenRects(const gfx::Rect& view_screen_rect,
@@ -760,6 +771,8 @@ class CONTENT_EXPORT RenderWidget
   // (e.g. BeginSmoothScroll).
   SyntheticGestureCompletionCallback pending_synthetic_gesture_;
 
+  SyntheticDelayConfigurationCallback pending_delay_configuration_;
+
   // Specified whether the compositor will run in its own thread.
   bool is_threaded_compositing_enabled_;