Add new latency_info for tracking browser composite time.

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 92d928d615837d1323f07112b9244c135af4e67d..6e8fbfeee98bcdf726e197aa5f320134c0b1aba7 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -54,6 +54,13 @@ enum LatencyComponentType {
   WINDOW_OLD_SNAPSHOT_FRAME_NUMBER_COMPONENT,
   // Timestamp when a tab is requested to be shown.
   TAB_SHOW_COMPONENT,
+  // Timestamp of when the Browser process began compositing
+  INPUT_EVENT_RENDERER_SWAP_RECEIVED_COMPONENT,
+  // Timestamp of when the Browser process began swap buffers
+  INPUT_EVENT_BROWSER_SWAP_BUFFER_COMPONENT,
+  // Timestamp of when the gpu service began swap buffers, unlike
+  // INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT which measure after
+  INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT,
   // ---------------------------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