[general] moving ios and android project under ./platform folder

src/mbgl/util/thread.cpp

@@ -0,0 +1,19 @@
+#include <functional>
+#include <mbgl/platform/settings.hpp>
+#include <mbgl/util/platform.hpp>
+
+namespace mbgl {
+namespace util {
+std::function<void()> makeThreadPrioritySetter(std::string threadType_) {
+    return [threadType = std::move(threadType_)] {
+        auto& settings = platform::Settings::getInstance();
+        auto value = settings.get(threadType);
+        if (auto* priority = value.getDouble()) {
+            platform::setCurrentThreadPriority(*priority);
+        } else {
+            platform::makeThreadLowPriority();
+        }
+    };
+}
+} // namespace util
+} // namespace mbgl