Synthesize ctrl-wheel events on touchpad pinch

content/browser/renderer_host/input/mock_input_ack_handler.cc

Index: content/browser/renderer_host/input/mock_input_ack_handler.cc
diff --git a/content/browser/renderer_host/input/mock_input_ack_handler.cc b/content/browser/renderer_host/input/mock_input_ack_handler.cc
index 0ab903f8c8494d5fbc92e5b83c4a85d64e0721fa..a957995e58489d696935abc92d86b391dcac98bf 100644
--- a/content/browser/renderer_host/input/mock_input_ack_handler.cc
+++ b/content/browser/renderer_host/input/mock_input_ack_handler.cc
@@ -30,7 +30,7 @@ void MockInputAckHandler::OnKeyboardEventAck(
     InputEventAckState ack_result)  {
   VLOG(1) << __FUNCTION__ << " called!";
   acked_key_event_ = event;
-  RecordAckCalled(ack_result);
+  RecordAckCalled(event.type, ack_result);
 }
 
 void MockInputAckHandler::OnWheelEventAck(
@@ -38,7 +38,7 @@ void MockInputAckHandler::OnWheelEventAck(
     InputEventAckState ack_result) {
   VLOG(1) << __FUNCTION__ << " called!";
   acked_wheel_event_ = event.event;
-  RecordAckCalled(ack_result);
+  RecordAckCalled(event.event.type, ack_result);
 }
 
 void MockInputAckHandler::OnTouchEventAck(
@@ -46,7 +46,7 @@ void MockInputAckHandler::OnTouchEventAck(
     InputEventAckState ack_result) {
   VLOG(1) << __FUNCTION__ << " called!";
   acked_touch_event_ = event;
-  RecordAckCalled(ack_result);
+  RecordAckCalled(event.event.type, ack_result);
   if (touch_followup_event_)
     input_router_->SendTouchEvent(*touch_followup_event_);
   if (gesture_followup_event_)
@@ -58,7 +58,7 @@ void MockInputAckHandler::OnGestureEventAck(
     InputEventAckState ack_result) {
   VLOG(1) << __FUNCTION__ << " called!";
   acked_gesture_event_ = event.event;
-  RecordAckCalled(ack_result);
+  RecordAckCalled(event.event.type, ack_result);
 }
 
 void MockInputAckHandler::OnUnexpectedEventAck(UnexpectedEventAckType type)  {
@@ -72,7 +72,9 @@ size_t MockInputAckHandler::GetAndResetAckCount() {
   return ack_count;
 }
 
-void MockInputAckHandler::RecordAckCalled(InputEventAckState ack_result) {
+void MockInputAckHandler::RecordAckCalled(blink::WebInputEvent::Type type,
+                                          InputEventAckState ack_result) {
+  ack_event_type_ = type;
   ++ack_count_;
   ack_state_ = ack_result;
 }