Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

Source/platform/graphics/ImageAnimationPolicy.h

Index: Source/platform/graphics/ImageAnimationPolicy.h
diff --git a/Source/platform/graphics/ImageAnimationPolicy.h b/Source/platform/graphics/ImageAnimationPolicy.h
new file mode 100644
index 0000000000000000000000000000000000000000..1b7f20cd874b956d6491da10989535f19c7418c6
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+++ b/Source/platform/graphics/ImageAnimationPolicy.h
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+// Copyright 2014 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 ImageAnimationPolicy_h
+#define ImageAnimationPolicy_h
+
+namespace blink {
+
+// ImageAnimationPolicy is used for controlling image animation
+// when image frame is rendered for animation
+
+enum ImageAnimationPolicy {
+    // Animate the image (the default).
+    ImageAnimationPolicyAllowed,
+    // Animate image just once.
+    ImageAnimationPolicyAnimateOnce,
+    // Show the first frame and do not animate.
+    ImageAnimationPolicyNoAnimation
+};
+
+} // namespace blink
+
+#endif // ImageAnimationPolicy_h