[blimp] Add SkPicture caching support.

cc/test/fake_client_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 "cc/test/fake_client_picture_cache.h"
+
+#include "cc/test/picture_cache_model.h"
+#include "third_party/skia/include/core/SkPicture.h"
+
+namespace cc {
+
+FakeClientPictureCache::FakeClientPictureCache(PictureCacheModel* model)
+    : model_(model) {}
+
+FakeClientPictureCache::~FakeClientPictureCache() = default;
+
+const std::vector<uint32_t>& FakeClientPictureCache::GetAllUsedPictureIds() {
+  return used_picture_ids_;
+}
+
+void FakeClientPictureCache::MarkUsed(uint32_t engine_picture_id) {
+  used_picture_ids_.push_back(engine_picture_id);
+}
+
+sk_sp<const SkPicture> FakeClientPictureCache::GetPicture(uint32_t unique_id) {
+  if (!model_)
+    return nullptr;
+
+  return model_->GetPicture(unique_id);
+}
+
+void FakeClientPictureCache::ApplyCacheUpdate(
+    const std::vector<PictureData>& cache_update) {}
+
+void FakeClientPictureCache::Flush() {}
+
+}  // namespace cc