Make sure send one WebTouchEvent ack per ui::TouchEvent

ui/events/blink/blink_event_util.cc

Index: ui/events/blink/blink_event_util.cc
diff --git a/ui/events/blink/blink_event_util.cc b/ui/events/blink/blink_event_util.cc
index 35c307efea919f6e6a9d022a8820bdabad173a56..3039bdd18022a5b862758b026a07fce5903621be 100644
--- a/ui/events/blink/blink_event_util.cc
+++ b/ui/events/blink/blink_event_util.cc
@@ -53,11 +53,15 @@ WebTouchPoint::State ToWebTouchPointState(const MotionEvent& event,
     case MotionEvent::ACTION_DOWN:
       return WebTouchPoint::StatePressed;
     case MotionEvent::ACTION_MOVE:
-      return WebTouchPoint::StateMoved;
+      return static_cast<int>(pointer_index) == event.GetActionIndex()

[tdresser, 2015/05/04 20:39:37]

GetActionIndex is only valid if |GetAction()| returns ACTION_POINTER_UP or
ACTION_POINTER_DOWN.

+                 ? WebTouchPoint::StateMoved
+                 : WebTouchPoint::StateStationary;
     case MotionEvent::ACTION_UP:
       return WebTouchPoint::StateReleased;
     case MotionEvent::ACTION_CANCEL:
-      return WebTouchPoint::StateCancelled;
+      return static_cast<int>(pointer_index) == event.GetActionIndex()
+                 ? WebTouchPoint::StateCancelled
+                 : WebTouchPoint::StateStationary;
     case MotionEvent::ACTION_POINTER_DOWN:
       return static_cast<int>(pointer_index) == event.GetActionIndex()
                  ? WebTouchPoint::StatePressed