Added gradle and cmake project

*** 60,69 ****
--- 60,70 ----
  import com.apple.laf.ClientPropertyApplicator.Property;
  import sun.awt.AWTAccessor;
  import sun.awt.AWTAccessor.ComponentAccessor;
  import sun.awt.AWTAccessor.WindowAccessor;
  import sun.java2d.SurfaceData;
+ import sun.java2d.metal.MTLSurfaceData;
  import sun.java2d.opengl.CGLSurfaceData;
  import sun.lwawt.LWLightweightFramePeer;
  import sun.lwawt.LWToolkit;
  import sun.lwawt.LWWindowPeer;
  import sun.lwawt.LWWindowPeer.PeerType;
*** 1054,1063 ****
--- 1055,1066 ----
  
      private void validateSurface() {
          SurfaceData surfaceData = getSurfaceData();
          if (surfaceData instanceof CGLSurfaceData) {
              ((CGLSurfaceData)surfaceData).validate();
+         } else if (surfaceData instanceof MTLSurfaceData) {
+             ((MTLSurfaceData)surfaceData).validate();
          }
      }
  
      void flushBuffers() {
          if (isVisible() && !nativeBounds.isEmpty() && !isFullScreenMode) {