Remove all blimp engine code

blimp/engine/renderer/blimp_engine_picture_cache.cc

-// 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.
-
-#include "blimp/engine/renderer/blimp_engine_picture_cache.h"
-
-#include "base/logging.h"
-#include "base/memory/ptr_util.h"
-
-namespace blimp {
-namespace engine {
-
-BlimpEnginePictureCache::BlimpEnginePictureCache(
-    SkPixelSerializer* pixel_serializer)
-    : pixel_serializer_(pixel_serializer) {}
-
-BlimpEnginePictureCache::~BlimpEnginePictureCache() = default;
-
-void BlimpEnginePictureCache::MarkUsed(const SkPicture* picture) {
-  DCHECK(picture);
-  reference_tracker_.IncrementRefCount(picture->uniqueID());
-
-  // Do not serialize multiple times, even though the item is referred to from
-  // multiple places.
-  if (pictures_.find(picture->uniqueID()) != pictures_.end()) {
-    return;
-  }
-
-  Put(picture);
-}
-
-std::vector<cc::PictureData>
-BlimpEnginePictureCache::CalculateCacheUpdateAndFlush() {
-  std::vector<uint32_t> added;
-  std::vector<uint32_t> removed;
-  reference_tracker_.CommitRefCounts(&added, &removed);
-
-  // Create cache update consisting of new pictures.
-  std::vector<cc::PictureData> update;
-  for (const uint32_t item : added) {
-    auto entry = pictures_.find(item);
-    DCHECK(entry != pictures_.end());
-    update.push_back(entry->second);
-  }
-
-  // All new items will be sent to the client, so clear everything.
-  pictures_.clear();
-  reference_tracker_.ClearRefCounts();
-
-  return update;
-}
-
-void BlimpEnginePictureCache::Put(const SkPicture* picture) {
-  sk_sp<SkData> data = picture->serialize(pixel_serializer_);
-  DCHECK_GE(data->size(), 0u);
-
-  // Store the picture data until it is sent to the client.
-  pictures_.insert(
-      std::make_pair(picture->uniqueID(),
-                     cc::PictureData(picture->uniqueID(), std::move(data))));
-}
-
-}  // namespace engine
-}  // namespace blimp