[blimp] Add SkPicture caching support.

cc/test/fake_client_picture_cache.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_TEST_FAKE_CLIENT_PICTURE_CACHE_H_
+#define CC_TEST_FAKE_CLIENT_PICTURE_CACHE_H_
+
+#include <stdint.h>
+
+#include <map>
+#include <memory>
+
+#include "base/macros.h"
+#include "cc/blimp/client_picture_cache.h"
+
+namespace cc {
+class PictureCacheModel;
+
+class FakeClientPictureCache : public ClientPictureCache {
+ public:
+  explicit FakeClientPictureCache(PictureCacheModel* model);
+  ~FakeClientPictureCache() override;
+
+  const std::vector<uint32_t>& GetAllUsedPictureIds();
+
+  // ClientPictureCache implementation.
+  void MarkUsed(uint32_t engine_picture_id) override;
+  sk_sp<const SkPicture> GetPicture(uint32_t unique_id) override;
+  void ApplyCacheUpdate(const std::vector<PictureData>& cache_update) override;
+  void Flush() override;
+
+ private:
+  PictureCacheModel* model_;
+  std::vector<uint32_t> used_picture_ids_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeClientPictureCache);
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_CLIENT_PICTURE_CACHE_H_