[blimp] Add SkPicture caching support.

cc/blimp/picture_data.h

+// Copyright 2016 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_BLIMP_PICTURE_DATA_H_
+#define CC_BLIMP_PICTURE_DATA_H_
+
+#include <stdint.h>
+
+#include "cc/base/cc_export.h"
+#include "third_party/skia/include/core/SkData.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+
+namespace cc {
+
+// PictureData is a holder object for a serialized SkPicture and its unique ID.
+struct CC_EXPORT PictureData {
+  PictureData(uint32_t unique_id, sk_sp<SkData> data);
+  PictureData(const PictureData& other);
+  ~PictureData();
+
+  uint32_t unique_id;
+  sk_sp<SkData> data;
+};
+
+}  // namespace cc
+
+#endif  // CC_BLIMP_PICTURE_DATA_H_