Currently telemetry tests such as smoothness (e.g. rasterize_and_record_micro.top_25) use content::SyntheticGesture to drive the smoothness. Because this code starts sending events from content through blink, cc, gpu, it ignores the overhead from the Chrome browser (or Mus) ui code.

Given that the mustash project is altering the ui code and cc/gpu code, we'd like to ensure that we can measure as much of the ui event handling code between mus and !mus configurations.

So: generalize / modify the telemetry event code to include the layer using ozone/x11 platform.