[Compositor event queue] Coalesce gesture scroll&pinch of the same sequence

ui/events/blink/event_with_callback.cc

Index: ui/events/blink/event_with_callback.cc
diff --git a/ui/events/blink/event_with_callback.cc b/ui/events/blink/event_with_callback.cc
index bcbd862ec5208e8ef3c4b3ad7b7d01c1575c8f9c..fff765c6c5ea20f1508d3a32b6d6683bde434d1b 100644
--- a/ui/events/blink/event_with_callback.cc
+++ b/ui/events/blink/event_with_callback.cc
@@ -26,6 +26,20 @@ EventWithCallback::EventWithCallback(
   original_events_.emplace_back(std::move(event), callback);
 }
 
+EventWithCallback::EventWithCallback(
+    ScopedWebInputEvent event,
+    const LatencyInfo& latency,
+    base::TimeTicks creation_timestamp,
+    base::TimeTicks last_coalesced_timestamp,
+    std::unique_ptr<OriginalEventList> original_events)
+    : event_(std::move(event)),
+      latency_(latency),
+      creation_timestamp_(creation_timestamp),
+      last_coalesced_timestamp_(last_coalesced_timestamp) {
+  if (original_events)
+    original_events_.splice(original_events_.end(), *original_events);
+}
+
 EventWithCallback::~EventWithCallback() {}
 
 bool EventWithCallback::CanCoalesceWith(const EventWithCallback& other) const {
@@ -69,6 +83,11 @@ void EventWithCallback::RunCallbacks(
   }
 }
 
+const blink::WebGestureEvent& EventWithCallback::ToWebGestureEvent() const {
+  DCHECK(blink::WebInputEvent::isGestureEventType(event_->type));
+  return static_cast<const blink::WebGestureEvent&>(*event_);
+}
+
 EventWithCallback::OriginalEventWithCallback::OriginalEventWithCallback(
     ScopedWebInputEvent event,
     const InputHandlerProxy::EventDispositionCallback& callback)