Use LatencyInfoSwapPromise to track LatencyInfo through compositor

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 ea3293cb3783c98b1516b8b21caeb62a9bb97af9..aac460206f5e4ba5b1b6757b74e0b3d3ed750082 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -38,6 +38,9 @@ enum LatencyComponentType {
   INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_COMPONENT,
   // Timestamp when the touch event is acked.
   INPUT_EVENT_LATENCY_ACKED_TOUCH_COMPONENT,
+  // Frame number when a window snapshot was requested. The snapshot
+  // is taken when the rendering results actually reach the screen.
+  WINDOW_SNAPSHOT_FRAME_NUMBER_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
@@ -52,9 +55,15 @@ enum LatencyComponentType {
   // 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,
-  // Frame number when a window snapshot was requested. The snapshot
-  // is taken when the rendering results actually reach the screen.
-  WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT
+  // This component indicats that the input causes a commit to be scheduled

[sadrul, 2013/11/27 22:48:13]

*indicates

[Yufeng Shen (Slow to review), 2013/11/27 22:55:06]

Done.

+  // but the commit failed.
+  INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT,
+  // This component indicats that the input causes a swap to be scheduled

[sadrul, 2013/11/27 22:48:13]

ditto

[Yufeng Shen (Slow to review), 2013/11/27 22:55:06]

Done.

+  // but the swap failed.
+  INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
+  // This component indicats that the cached LatencyInfo number exceeds the

[sadrul, 2013/11/27 22:48:13]

ditto

[Yufeng Shen (Slow to review), 2013/11/27 22:55:06]

Done.

+  // maximal allowed size.
+  LATENCY_INFO_LIST_TERMINATED_OVERFLOW_COMPONENT,
 };
 
 struct EVENTS_BASE_EXPORT LatencyInfo {