Support pixelRatio during reprojection

src/ol/source/tileimagesource.js

@@ -208,7 +208,8 @@ ol.source.TileImage.prototype.getTile =
       var tile = new ol.reproj.Tile(
           sourceProjection, sourceTileGrid,
           projection, targetTileGrid,
-          z, x, y, pixelRatio, goog.bind(function(z, x, y, pixelRatio) {
+          z, x, y, this.getTilePixelRatio(),
+          goog.bind(function(z, x, y, pixelRatio) {
             return this.getTileInternal(z, x, y, pixelRatio, sourceProjection);
           }, this), this.reprojectionErrorThreshold_,
           this.renderReprojectionEdges_);

src/ol/source/tilesource.js

@@ -230,6 +230,14 @@ ol.source.Tile.prototype.getTileCacheForProjection = function(projection) {
 };
 
 
+/**
+ * @return {number}
+ */
+ol.source.Tile.prototype.getTilePixelRatio = function() {
+  return this.tilePixelRatio_;
+};
+
+
 /**
  * @param {number} z Z.
  * @param {number} pixelRatio Pixel ratio.