WIP Add getCoalescedEvents API using vector of WebInputEvents

ui/events/blink/input_handler_proxy.cc

Index: ui/events/blink/input_handler_proxy.cc
diff --git a/ui/events/blink/input_handler_proxy.cc b/ui/events/blink/input_handler_proxy.cc
index 40d1415d9e9ec0a9493b194486da549f9aed5a8c..9357cd95a4ab44ec7b74c0eecc8321f7fd68114c 100644
--- a/ui/events/blink/input_handler_proxy.cc
+++ b/ui/events/blink/input_handler_proxy.cc
@@ -262,13 +262,13 @@ void InputHandlerProxy::WillShutdown() {
 }
 
 void InputHandlerProxy::HandleInputEventWithLatencyInfo(
-    ScopedWebInputEvent event,
+    blink::ScopedCoalescedWebInputEvent coalescedEvent,
     const LatencyInfo& latency_info,
     const EventDispositionCallback& callback) {
   DCHECK(input_handler_);
 
   if (uma_latency_reporting_enabled_)
-    ReportInputEventLatencyUma(*event, latency_info);
+    ReportInputEventLatencyUma(coalescedEvent->event(), latency_info);
 
   TRACE_EVENT_WITH_FLOW1("input,benchmark", "LatencyInfo.Flow",
                          TRACE_ID_DONT_MANGLE(latency_info.trace_id()),
@@ -281,7 +281,8 @@ void InputHandlerProxy::HandleInputEventWithLatencyInfo(
           &monitored_latency_info);
 
   current_overscroll_params_.reset();
-  InputHandlerProxy::EventDisposition disposition = HandleInputEvent(*event);
+  InputHandlerProxy::EventDisposition disposition =
+      HandleInputEvent(coalescedEvent->event());
   callback.Run(disposition, std::move(event), monitored_latency_info,
                std::move(current_overscroll_params_));
 }