Add some goog.requires to keep compiler happy

src/ol/source/imagearcgisrestsource.js

@@ -4,6 +4,7 @@ goog.require('goog.asserts');
 goog.require('goog.uri.utils');
 goog.require('ol');
 goog.require('ol.Image');
+goog.require('ol.ImageLoadFunctionType');
 goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('ol.extent');

src/ol/source/imagecanvassource.js

@@ -1,5 +1,6 @@
 goog.provide('ol.source.ImageCanvas');
 
+goog.require('ol.CanvasFunctionType');
 goog.require('ol.ImageCanvas');
 goog.require('ol.extent');
 goog.require('ol.source.Image');

src/ol/source/imagemapguidesource.js

@@ -4,6 +4,7 @@ goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('goog.uri.utils');
 goog.require('ol.Image');
+goog.require('ol.ImageLoadFunctionType');
 goog.require('ol.extent');
 goog.require('ol.object');
 goog.require('ol.source.Image');

src/ol/source/imagestaticsource.js

@@ -3,6 +3,7 @@ goog.provide('ol.source.ImageStatic');
 goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('ol.Image');
+goog.require('ol.ImageLoadFunctionType');
 goog.require('ol.ImageState');
 goog.require('ol.dom');
 goog.require('ol.extent');

src/ol/source/tileimagesource.js

@@ -3,6 +3,7 @@ goog.provide('ol.source.TileImage');
 goog.require('goog.asserts');
 goog.require('ol.ImageTile');
 goog.require('ol.TileCache');
+goog.require('ol.TileLoadFunctionType');
 goog.require('ol.TileState');
 goog.require('ol.events');
 goog.require('ol.events.EventType');

src/ol/source/vectortilesource.js

@@ -1,5 +1,6 @@
 goog.provide('ol.source.VectorTile');
 
+goog.require('ol.TileLoadFunctionType');
 goog.require('ol.TileState');
 goog.require('ol.VectorTile');
 goog.require('ol.events');