Use requestRenderFrame API in interactions

src/ol/interaction/dragrotateandzoominteraction.js

@@ -51,6 +51,7 @@ ol.interaction.DragRotateAndZoom.prototype.handleDrag =
       size.height / 2 - browserEvent.offsetY);
   var theta = Math.atan2(delta.y, delta.x);
   // FIXME this should use map.withFrozenRendering but an assertion fails :-(
+  map.requestRenderFrame();
   map.rotate(this.startRotation_, -theta);
   var resolution = this.startRatio_ * delta.magnitude();
   map.zoomToResolution(resolution);
@@ -73,6 +74,7 @@ ol.interaction.DragRotateAndZoom.prototype.handleDragStart =
     var theta = Math.atan2(delta.y, delta.x);
     this.startRotation_ = (map.getRotation() || 0) + theta;
     this.startRatio_ = resolution / delta.magnitude();
+    map.requestRenderFrame();
     return true;
   } else {
     return false;