Remove all blimp engine code

blimp/engine/renderer/blimp_engine_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 BLIMP_ENGINE_RENDERER_BLIMP_ENGINE_PICTURE_CACHE_H_
-#define BLIMP_ENGINE_RENDERER_BLIMP_ENGINE_PICTURE_CACHE_H_
-
-#include <memory>
-#include <unordered_map>
-#include <vector>
-
-#include "base/macros.h"
-#include "blimp/common/compositor/reference_tracker.h"
-#include "cc/blimp/engine_picture_cache.h"
-#include "cc/blimp/picture_data.h"
-#include "third_party/skia/include/core/SkPicture.h"
-
-class SkPixelSerializer;
-
-namespace blimp {
-namespace engine {
-
-// BlimpEnginePictureCache provides functionality for caching SkPictures before
-// they are sent from the engine to the client. The cache is cleared after
-// every time it is flushed which happens when CalculateCacheUpdateAndFlush()
-// is called. The expected state of what the client already has cached is
-// tracked. It is required to update this cache when an SkPicture
-// starts being used and when it is not longer in use by calling
-// MarkPictureForRegistration and MarkPictureForUnregistration respectively.
-// The lifetime of a cache matches the lifetime of a specific compositor.
-// All interaction with this class should happen on the main thread.
-class BlimpEnginePictureCache : public cc::EnginePictureCache {
- public:
-  explicit BlimpEnginePictureCache(SkPixelSerializer* pixel_serializer);
-  ~BlimpEnginePictureCache() override;
-
-  // cc::EnginePictureCache implementation.
-  void MarkUsed(const SkPicture* picture) override;
-  std::vector<cc::PictureData> CalculateCacheUpdateAndFlush() override;
-
- private:
-  // Serializes the SkPicture and adds it to |pictures_|.
-  void Put(const SkPicture* picture);
-
-  // A serializer that be used to pass in to SkPicture::serialize(...) for
-  // serializing the SkPicture to a stream.
-  SkPixelSerializer* pixel_serializer_;
-
-  // The current cache of pictures. Used for temporarily storing pictures until
-  // the next call to CalculateCacheUpdateAndFlush(), at which point this map
-  // is cleared.
-  std::unordered_map<uint32_t, cc::PictureData> pictures_;
-
-  // The reference tracker maintains the reference count of used SkPictures.
-  ReferenceTracker reference_tracker_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpEnginePictureCache);
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_RENDERER_BLIMP_ENGINE_PICTURE_CACHE_H_