Refactor image handling in Sky

sky/engine/core/loader/ImageLoaderCallback.h

Index: sky/engine/core/loader/ImageLoaderCallback.h
diff --git a/sky/engine/core/loader/ImageLoaderCallback.h b/sky/engine/core/loader/ImageLoaderCallback.h
new file mode 100644
index 0000000000000000000000000000000000000000..036c20610234b21ee04354b75c2246e844c58b6d
--- /dev/null
+++ b/sky/engine/core/loader/ImageLoaderCallback.h
@@ -0,0 +1,20 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SKY_ENGINE_CORE_LOADER_IMAGELOADERCALLBACK_H_
+#define SKY_ENGINE_CORE_LOADER_IMAGELOADERCALLBACK_H_
+
+#include "sky/engine/core/painting/CanvasImage.h"
+
+namespace blink {
+
+class ImageLoaderCallback {
+public:
+    virtual ~ImageLoaderCallback() {}
+    virtual void handleEvent(CanvasImage* result) = 0;
+};
+
+} // namespace blink
+
+#endif  // SKY_ENGINE_CORE_LOADER_IMAGELOADERCALLBACK_H_