[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, 2 insertions, 2 deletions

diff --git a/platform/qt/src/qmapboxgl_map_renderer.cpp b/platform/qt/src/qmapboxgl_map_renderer.cpp
index d72b5d0f2c..eba50af6bf 100644
--- a/platform/qt/src/qmapboxgl_map_renderer.cpp
+++ b/platform/qt/src/qmapboxgl_map_renderer.cpp
@@ -26,9 +26,9 @@ static auto *getScheduler() {
     return scheduler.localData().get();
 };
 
-QMapboxGLMapRenderer::QMapboxGLMapRenderer(qreal pixelRatio, mbgl::ThreadPool &tp, QMapboxGLSettings::GLContextMode mode, const QString &localFontFamily)
+QMapboxGLMapRenderer::QMapboxGLMapRenderer(qreal pixelRatio, QMapboxGLSettings::GLContextMode mode, const QString &localFontFamily)
     : m_backend(static_cast<mbgl::gfx::ContextMode>(mode)),
-      m_renderer(std::make_unique<mbgl::Renderer>(m_backend, pixelRatio, tp, mbgl::optional<std::string> {},
+      m_renderer(std::make_unique<mbgl::Renderer>(m_backend, pixelRatio, mbgl::optional<std::string> {},
                  localFontFamily.isEmpty() ? mbgl::nullopt : mbgl::optional<std::string> { localFontFamily.toStdString() }))
     , m_forceScheduler(needsToForceScheduler())
 {