[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, 2 deletions

diff --git a/include/mbgl/renderer/renderer.hpp b/include/mbgl/renderer/renderer.hpp
index 50483fcf4b..787f9dceee 100644
--- a/include/mbgl/renderer/renderer.hpp
+++ b/include/mbgl/renderer/renderer.hpp
@@ -14,7 +14,6 @@ namespace mbgl {
 
 class RendererObserver;
 class RenderedQueryOptions;
-class Scheduler;
 class SourceQueryOptions;
 class UpdateParameters;
 
@@ -24,7 +23,7 @@ class RendererBackend;
 
 class Renderer {
 public:
-    Renderer(gfx::RendererBackend&, float pixelRatio_, Scheduler&,
+    Renderer(gfx::RendererBackend&, float pixelRatio_,
              const optional<std::string> programCacheDir = {},
              const optional<std::string> localFontFamily = {});
     ~Renderer();