Ignore TouchCancel ack dispositions

content/browser/renderer_host/input/synthetic_web_input_event_builders.cc

Index: content/browser/renderer_host/input/synthetic_web_input_event_builders.cc
diff --git a/content/browser/renderer_host/input/synthetic_web_input_event_builders.cc b/content/browser/renderer_host/input/synthetic_web_input_event_builders.cc
index d6f782dafd8f153785b0bb3bc03c3036939a4975..09f38dc569762c30edcb43068a711f2523b62ee0 100644
--- a/content/browser/renderer_host/input/synthetic_web_input_event_builders.cc
+++ b/content/browser/renderer_host/input/synthetic_web_input_event_builders.cc
@@ -168,6 +168,12 @@ void SyntheticWebTouchEvent::ReleasePoint(int index) {
   type = WebInputEvent::TouchEnd;
 }
 
+void SyntheticWebTouchEvent::CancelPoint(int index) {
+  CHECK(index >= 0 && index < touchesLengthCap);
+  touches[index].state = WebTouchPoint::StateCancelled;
+  type = WebInputEvent::TouchCancel;
+}
+
 void SyntheticWebTouchEvent::SetTimestamp(base::TimeDelta timestamp) {
   timeStampSeconds = timestamp.InSecondsF();
 }