Flag 2D-specific code, thanks @elemoine

src/ol/animation.js

@@ -1,3 +1,5 @@
+// FIXME works for View2D only
+
 goog.provide('ol.animation');
 
 goog.require('goog.fx.easing');

src/ol/framestate.js

@@ -1,3 +1,5 @@
+// FIXME add view3DState
+
 goog.provide('ol.FrameState');
 goog.provide('ol.PostRenderFunction');
 goog.provide('ol.PreRenderFunction');

src/ol/map.js

@@ -585,6 +585,7 @@ ol.Map.prototype.renderFrame_ = function(time) {
       this);
 
   if (!goog.isNull(frameState)) {
+    // FIXME works for View2D only
     var center = view2DState.center;
     var resolution = view2DState.resolution;
     var rotation = view2DState.rotation;