Apply SmoothPointerDataDispatcher to Fuchsia (#14514)

Fixes https://bugs.fuchsia.dev/p/fuchsia/issues/detail?id=35050
and #38811

Author: liyuqian

shell/platform/fuchsia/flutter/platform_view.cc

@@ -766,4 +766,10 @@ void PlatformView::HandleFlutterPlatformViewsChannelPlatformMessage(
   }
 }
 
+flutter::PointerDataDispatcherMaker PlatformView::GetDispatcherMaker() {
+  return [](flutter::DefaultPointerDataDispatcher::Delegate& delegate) {
+    return std::make_unique<flutter::SmoothPointerDataDispatcher>(delegate);
+  };
+}
+
 }  // namespace flutter_runner

shell/platform/fuchsia/flutter/platform_view.h

@@ -70,6 +70,9 @@ class PlatformView final : public flutter::PlatformView,
   // |flutter_runner::AccessibilityBridge::Delegate|
   void SetSemanticsEnabled(bool enabled) override;
 
+  // |PlatformView|
+  flutter::PointerDataDispatcherMaker GetDispatcherMaker() override;
+
  private:
   const std::string debug_label_;
   // TODO(MI4-2490): remove once ViewRefControl is passed to Scenic and kept