Add crossOrigin option

Co-Authored-By: Andreas Hocevar <andreas.hocevar@gmail.com>

src/ol/style/literal.js

@@ -32,6 +32,7 @@ export const SymbolType = {
  * @property {ExpressionValue|Array<ExpressionValue, ExpressionValue>} size Size, mandatory.
  * @property {SymbolType} symbolType Symbol type to use, either a regular shape or an image.
  * @property {string} [src] Path to the image to be used for the symbol. Only required with `symbolType: 'image'`.
+ * @property {string} [crossOrigin='anonymous'] The `crossOrigin` attribute for loading `src`.
  * @property {import("../color.js").Color|Array<ExpressionValue>|string} [color='#FFFFFF'] Color used for the representation (either fill, line or symbol).
  * @property {ExpressionValue} [opacity=1] Opacity.
  * @property {ExpressionValue} [rotation=0] Symbol rotation in radians.

src/ol/webgl/ShaderBuilder.js

@@ -548,6 +548,8 @@ export function parseLiteralStyle(style) {
 
   if (symbStyle.symbolType === 'image' && symbStyle.src) {
     const texture = new Image();
+    texture.crossOrigin =
+      symbStyle.crossOrigin === undefined ? 'anonymous' : symbStyle.crossOrigin;
     texture.src = symbStyle.src;
     builder
       .addUniform('sampler2D u_texture')