Clean up LatencyInfo and RWHLatencyTracker.

ui/events/latency_info.h

Index: ui/events/latency_info.h
diff --git a/ui/events/latency_info.h b/ui/events/latency_info.h
index abb52dc1d600e8f3e3d50772db99a237bce66293..01898e695894a47457d52a3c583a8edb7f7c3938 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -86,22 +86,9 @@ enum LatencyComponentType {
   // event.
   INPUT_EVENT_LATENCY_GENERATE_SCROLL_UPDATE_FROM_MOUSE_WHEEL,
   // ---------------------------TERMINAL COMPONENT-----------------------------
-  // TERMINAL COMPONENT is when we show the latency end in chrome://tracing.
-  // Timestamp when the mouse event is acked from renderer and it does not
-  // cause any rendering scheduled.
-  INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT,
-  // Timestamp when the mouse wheel event is acked from renderer and it does not
-  // cause any rendering scheduled.
-  INPUT_EVENT_LATENCY_TERMINATED_MOUSE_WHEEL_COMPONENT,
-  // Timestamp when the keyboard event is acked from renderer and it does not
-  // cause any rendering scheduled.
-  INPUT_EVENT_LATENCY_TERMINATED_KEYBOARD_COMPONENT,
-  // Timestamp when the touch event is acked from renderer and it does not
-  // cause any rendering scheduled and does not generate any gesture event.
-  INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT,
-  // Timestamp when the gesture event is acked from renderer, and it does not
-  // cause any rendering scheduled.
-  INPUT_EVENT_LATENCY_TERMINATED_GESTURE_COMPONENT,
+  // Timestamp when the event is acked from renderer when it does not
+  // cause any rendering to be scheduled.
+  INPUT_EVENT_LATENCY_TERMINATED_COMPONENT,

[dtapuska, 2016/12/15 14:54:49]

Can we be a little more detailed what the reason behind the termination was?
ie; NO_SWAP or something?

[tdresser, 2016/12/15 15:26:37]

Done.

   // Timestamp when the frame is swapped (i.e. when the rendering caused by
   // input event actually takes effect).
   INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,