[core] Added mbgl::util::DEFAULT_TRANSITION_EASE

include/mbgl/util/constants.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <mbgl/util/chrono.hpp>
+#include <mbgl/util/unitbezier.hpp>
 
 #include <cmath>
 #include <string>
@@ -40,6 +41,8 @@ constexpr uint64_t DEFAULT_MAX_CACHE_SIZE = 50 * 1024 * 1024;
 constexpr Duration DEFAULT_FADE_DURATION = Milliseconds(300);
 constexpr Seconds CLOCK_SKEW_RETRY_TIMEOUT { 30 };
 
+constexpr UnitBezier DEFAULT_TRANSITION_EASE = { 0, 0, 0.25, 1 };
+
 } // namespace util
 
 namespace debug {