[blimp] Add SkPicture caching support.

cc/test/fake_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_PICTURE_CACHE_H_
+#define CC_TEST_FAKE_PICTURE_CACHE_H_
+
+#include <map>
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "cc/proto/picture_cache.h"
+
+namespace cc {
+
+// FakePictureCacheModel provides a way for sharing a cache between an engine
+// and the client. When the FakeEnginePictureCache and the ClientPictureCache
+// point to the same FakePictureCacheModel, the calls to AddPicture on the
+// engine make an SkPicture available through GetPicture on the client.
+class FakePictureCacheModel {
+ public:
+  FakePictureCacheModel();
+  ~FakePictureCacheModel();
+
+  void AddPicture(const SkPicture* picture);
+
+  sk_sp<const SkPicture> GetPicture(uint32_t unique_id);
+
+ private:
+  std::map<uint32_t, sk_sp<const SkPicture>> pictures_;
+};
+
+class FakeEnginePictureCache : public EnginePictureCache {
+ public:
+  explicit FakeEnginePictureCache(FakePictureCacheModel* model);
+  ~FakeEnginePictureCache() override;
+
+  // EnginePictureCache implementation.
+  PictureCacheUpdate CalculateCacheUpdateAndFlush() override;
+  void MarkPictureForUnregistration(const SkPicture* picture) override;
+  void MarkPictureForRegistration(const SkPicture* picture) override;
+
+ private:
+  FakePictureCacheModel* model_;
+};
+
+class FakeClientPictureCache : public ClientPictureCache {
+ public:
+  explicit FakeClientPictureCache(FakePictureCacheModel* model);
+  ~FakeClientPictureCache() override;
+
+  // ClientPictureCache implementation.
+  sk_sp<const SkPicture> GetPicture(uint32_t unique_id) override;
+  void ApplyCacheUpdate(const PictureCacheUpdate& cache_update) override;
+  void Flush() override;
+  void MarkPictureForUnregistration(uint32_t engine_picture_id) override;
+  void MarkPictureForRegistration(uint32_t engine_picture_id) override;
+
+ private:
+  FakePictureCacheModel* model_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_PICTURE_CACHE_H_