[core] Make the BackgroundScheduler a singleton

- Do not carry it over everywhere as parameter, it is a shared
  instance anyway and the lifecycle is pretty much the app lifecycle
  from the moment we instantiate a map.
- Rename to BackgroundScheduler because it is a Scheduler that will
  do tasks in the background, we don't make assumptions if it is a
  thread pool or a single thread.
- Most importantly, remove the dependency from `core` on `platform`.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/mbgl/map/map_impl.cpp b/src/mbgl/map/map_impl.cpp
index 1ec7255822..fa15461ff2 100644
--- a/src/mbgl/map/map_impl.cpp
+++ b/src/mbgl/map/map_impl.cpp
@@ -9,18 +9,16 @@ namespace mbgl {
 
 Map::Impl::Impl(RendererFrontend& frontend_,
                 MapObserver& observer_,
-                Scheduler& scheduler_,
                 std::shared_ptr<FileSource> fileSource_,
                 const MapOptions& mapOptions)
         : observer(observer_),
           rendererFrontend(frontend_),
-          scheduler(scheduler_),
           transform(observer, mapOptions.constrainMode(), mapOptions.viewportMode()),
           mode(mapOptions.mapMode()),
           pixelRatio(mapOptions.pixelRatio()),
           crossSourceCollisions(mapOptions.crossSourceCollisions()),
           fileSource(std::move(fileSource_)),
-          style(std::make_unique<style::Style>(scheduler, *fileSource, pixelRatio)),
+          style(std::make_unique<style::Style>(*fileSource, pixelRatio)),
           annotationManager(*style) {
     transform.setNorthOrientation(mapOptions.northOrientation());
     style->impl->setObserver(this);