Move Update to its own header file

include/mbgl/map/map.hpp

@@ -3,6 +3,7 @@
 
 #include <mbgl/map/transform.hpp>
 #include <mbgl/util/chrono.hpp>
+#include <mbgl/map/update.hpp>
 #include <mbgl/util/geo.hpp>
 #include <mbgl/util/projection.hpp>
 #include <mbgl/util/noncopyable.hpp>
@@ -76,14 +77,6 @@ public:
     void render();
 
     // Notifies the Map thread that the state has changed and an update might be necessary.
-    using UpdateType = uint32_t;
-    enum class Update : UpdateType {
-        Nothing                   = 0,
-        StyleInfo                 = 1 << 0,
-        Debug                     = 1 << 1,
-        DefaultTransitionDuration = 1 << 2,
-        Classes                   = 1 << 3,
-    };
     void triggerUpdate(Update = Update::Nothing);
 
     // Triggers a render. Can be called from any thread.

include/mbgl/map/update.hpp

@@ -0,0 +1,18 @@
+#ifndef MBGL_MAP_UPDATE
+#define MBGL_MAP_UPDATE
+
+namespace mbgl {
+
+using UpdateType = uint32_t;
+
+enum class Update : UpdateType {
+    Nothing                   = 0,
+    StyleInfo                 = 1 << 0,
+    Debug                     = 1 << 1,
+    DefaultTransitionDuration = 1 << 2,
+    Classes                   = 1 << 3,
+};
+
+}
+
+#endif