[blimp] Add SkPicture caching support.

cc/test/fake_engine_picture_cache.h

Index: cc/test/fake_engine_picture_cache.h
diff --git a/cc/test/fake_engine_picture_cache.h b/cc/test/fake_engine_picture_cache.h
new file mode 100644
index 0000000000000000000000000000000000000000..4510419516c1a66fe7111b023bf8094b62fdccf6
--- /dev/null
+++ b/cc/test/fake_engine_picture_cache.h
@@ -0,0 +1,43 @@
+// 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_ENGINE_PICTURE_CACHE_H_
+#define CC_TEST_FAKE_ENGINE_PICTURE_CACHE_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "base/macros.h"
+#include "cc/blimp/engine_picture_cache.h"
+
+class SkPicture;
+
+namespace cc {
+class DisplayItemList;
+class PictureCacheModel;
+struct PictureData;
+
+class FakeEnginePictureCache : public EnginePictureCache {
+ public:
+  explicit FakeEnginePictureCache(PictureCacheModel* model);
+  ~FakeEnginePictureCache() override;
+
+  void MarkAllSkPicturesAsUsed(const DisplayItemList* display_list);
+  const std::vector<uint32_t>& GetAllUsedPictureIds();
+
+  // EnginePictureCache implementation.
+  std::vector<PictureData> CalculateCacheUpdateAndFlush() override;
+  void MarkUsed(const SkPicture* picture) override;
+
+ private:
+  PictureCacheModel* model_;
+  std::vector<uint32_t> used_picture_ids_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeEnginePictureCache);
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_ENGINE_PICTURE_CACHE_H_