Make ui::test::EventGenerator work with PointerEvents in mash

ui/events/test/event_generator.cc

Index: ui/events/test/event_generator.cc
diff --git a/ui/events/test/event_generator.cc b/ui/events/test/event_generator.cc
index 77b709eb20629988c2d5184386070b9199e3dd16..1abe3a750924579419ef9f84d0bc8832a8951f8c 100644
--- a/ui/events/test/event_generator.cc
+++ b/ui/events/test/event_generator.cc
@@ -686,6 +686,7 @@ void EventGenerator::DoDispatchEvent(ui::Event* event, bool async) {
   } else {
     if (event->IsKeyEvent())
       delegate()->DispatchKeyEventToIME(current_target_, event->AsKeyEvent());
+    MaybeDispatchToPointerWatchers(event);
     if (!event->handled()) {
       ui::EventSource* event_source =
           delegate()->GetEventSource(current_target_);
@@ -697,6 +698,27 @@ void EventGenerator::DoDispatchEvent(ui::Event* event, bool async) {
   }
 }
 
+void EventGenerator::MaybeDispatchToPointerWatchers(Event* event) {
+  // Regular pointer events can be dispatched directly.
+  if (event->IsPointerEvent()) {
+    delegate()->DispatchEventToPointerWatchers(current_target_,
+                                               *event->AsPointerEvent());
+    return;
+  }
+
+  // PointerWatchers always use pointer events, so mouse and touch events
+  // need to be converted.
+  if (!PointerEvent::CanConvertFrom(*event))
+    return;
+  if (event->IsMouseEvent()) {
+    delegate()->DispatchEventToPointerWatchers(
+        current_target_, PointerEvent(*event->AsMouseEvent()));
+  } else if (event->IsTouchEvent()) {
+    delegate()->DispatchEventToPointerWatchers(
+        current_target_, PointerEvent(*event->AsTouchEvent()));
+  }
+}
+
 void EventGenerator::DispatchNextPendingEvent() {
   DCHECK(!pending_events_.empty());
   ui::Event* event = pending_events_.front().get();