Provide ol.RendererType structure through ol.renderer.Map

It was previously in ol.Map, but it could not be provided because
of circular dependencies.

src/ol/map.js

@@ -42,6 +42,7 @@ goog.require('ol.ObjectEventType');
 goog.require('ol.Pixel');
 goog.require('ol.PostRenderFunction');
 goog.require('ol.PreRenderFunction');
+goog.require('ol.RendererType');
 goog.require('ol.Size');
 goog.require('ol.Tile');
 goog.require('ol.TileQueue');
@@ -98,18 +99,6 @@ ol.OL3_LOGO_URL = 'data:image/png;base64,' +
     'q82CM2MwKeibqAvSO7MCABq0wXEPiqWEAAAAAElFTkSuQmCC';
 
 
-/**
- * Available renderers: `'canvas'`, `'dom'` or `'webgl'`.
- * @enum {string}
- * @todo api
- */
-ol.RendererType = {
-  CANVAS: 'canvas',
-  DOM: 'dom',
-  WEBGL: 'webgl'
-};
-
-
 /**
  * @type {Array.<ol.RendererType>}
  */

src/ol/renderer/canvas/canvasmaprenderer.js

@@ -7,6 +7,7 @@ goog.require('goog.dom');
 goog.require('goog.style');
 goog.require('goog.vec.Mat4');
 goog.require('ol');
+goog.require('ol.RendererType');
 goog.require('ol.css');
 goog.require('ol.dom');
 goog.require('ol.layer.Image');
@@ -130,7 +131,7 @@ ol.renderer.canvas.Map.prototype.getCanvasLayerRenderer = function(layer) {
  * @inheritDoc
  */
 ol.renderer.canvas.Map.prototype.getType = function() {
-  return 'canvas';
+  return ol.RendererType.CANVAS;
 };
 
 

src/ol/renderer/dom/dommaprenderer.js

@@ -6,6 +6,7 @@ goog.require('goog.dom.TagName');
 goog.require('goog.functions');
 goog.require('goog.style');
 goog.require('ol');
+goog.require('ol.RendererType');
 goog.require('ol.css');
 goog.require('ol.layer.Image');
 goog.require('ol.layer.Tile');
@@ -79,7 +80,7 @@ ol.renderer.dom.Map.prototype.createLayerRenderer = function(layer) {
  * @inheritDoc
  */
 ol.renderer.dom.Map.prototype.getType = function() {
-  return 'dom';
+  return ol.RendererType.DOM;
 };
 
 

src/ol/renderer/maprenderer.js

@@ -1,3 +1,4 @@
+goog.provide('ol.RendererType');
 goog.provide('ol.renderer.Map');
 
 goog.require('goog.Disposable');
@@ -11,6 +12,18 @@ goog.require('ol.style.IconImageCache');
 goog.require('ol.vec.Mat4');
 
 
+/**
+ * Available renderers: `'canvas'`, `'dom'` or `'webgl'`.
+ * @enum {string}
+ * @todo api
+ */
+ol.RendererType = {
+  CANVAS: 'canvas',
+  DOM: 'dom',
+  WEBGL: 'webgl'
+};
+
+
 
 /**
  * @constructor

src/ol/renderer/webgl/webglmaprenderer.js

@@ -13,6 +13,7 @@ goog.require('goog.object');
 goog.require('goog.style');
 goog.require('goog.webgl');
 goog.require('ol');
+goog.require('ol.RendererType');
 goog.require('ol.Tile');
 goog.require('ol.css');
 goog.require('ol.dom');
@@ -350,7 +351,7 @@ ol.renderer.webgl.Map.prototype.getTileTextureQueue = function() {
  * @inheritDoc
  */
 ol.renderer.webgl.Map.prototype.getType = function() {
-  return 'webgl';
+  return ol.RendererType.WEBGL;
 };