paint: Introduce PaintImage that wraps SkImage in paint calls.

cc/paint/paint_image.h

+// Copyright 2017 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 CC_PAINT_PAINT_IMAGE_H_
+#define CC_PAINT_PAINT_IMAGE_H_
+
+#include "cc/paint/paint_export.h"
+
+#include "third_party/skia/include/core/SkImage.h"
+
+namespace cc {
+
+// TODO(vmpstr): Add a persistent id to the paint image.
+class CC_PAINT_EXPORT PaintImage {
+ public:
+  // TODO(vmpstr): Work towards removing "UNKNOWN" value.
+  enum class AnimationType { UNKNOWN, ANIMATED, VIDEO, STATIC };
+
+  // TODO(vmpstr): Work towards removing "UNKNOWN" value.
+  enum class CompletionState { UNKNOWN, DONE, PARTIALLY_DONE };
+
+  PaintImage(sk_sp<const SkImage> sk_image,
+             AnimationType animation_type,
+             CompletionState completion_state);
+  ~PaintImage();
+
+  const sk_sp<const SkImage>& sk_image() const { return sk_image_; }
+  AnimationType animation_type() const { return animation_type_; }
+  CompletionState completion_state() const { return completion_state_; }
+
+ private:
+  sk_sp<const SkImage> sk_image_;
+  AnimationType animation_type_;
+  CompletionState completion_state_;
+};
+
+}  // namespace cc
+
+#endif  // CC_PAINT_PAINT_IMAGE_H_