[Mac] Don't dispatch wheel events for PhaseMayBegin|Cancelled|Ended

components/test_runner/event_sender.cc

Index: components/test_runner/event_sender.cc
diff --git a/components/test_runner/event_sender.cc b/components/test_runner/event_sender.cc
index be730ccc00809fa273ecd47071c9eb71d6e49259..231531dea7a428d77efdefd64a3cca7da65cfa7b 100644
--- a/components/test_runner/event_sender.cc
+++ b/components/test_runner/event_sender.cc
@@ -2540,6 +2540,7 @@ void EventSender::InitMouseWheelEvent(gin::Arguments* args,
   bool paged = false;
   bool has_precise_scrolling_deltas = false;
   int modifiers = 0;
+  int phase = 0;
   if (!args->PeekNext().IsEmpty()) {
     args->GetNext(&paged);
     if (!args->PeekNext().IsEmpty()) {
@@ -2550,6 +2551,9 @@ void EventSender::InitMouseWheelEvent(gin::Arguments* args,
         modifiers = GetKeyModifiersFromV8(args->isolate(), value);
         if (!args->PeekNext().IsEmpty()) {
           args->GetNext(send_gestures);
+          if (!args->PeekNext().IsEmpty()) {

[dtapuska, 2016/06/30 19:53:00]

This is kind of weird that we will cast a value from javascript into an enum.
Usually there is some indirection like for modifiers it goes through a String ->
flags conversion.

[chongz, 2016/07/04 14:12:36]

Done.

+            args->GetNext(&phase);
+          }
         }
       }
     }
@@ -2566,6 +2570,7 @@ void EventSender::InitMouseWheelEvent(gin::Arguments* args,
   event->deltaY = event->wheelTicksY;
   event->scrollByPage = paged;
   event->hasPreciseScrollingDeltas = has_precise_scrolling_deltas;
+  event->phase = static_cast<WebMouseWheelEvent::Phase>(phase);
   if (scroll_type == MouseScrollType::PIXEL) {
     event->wheelTicksX /= kScrollbarPixelsPerTick;
     event->wheelTicksY /= kScrollbarPixelsPerTick;