[blimp] Add SkPicture caching support.

cc/test/fake_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_picture_cache.h"
+
+#include <map>
+#include <memory>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "cc/proto/picture_cache.h"
+#include "third_party/skia/include/core/SkData.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/core/SkStream.h"
+
+namespace cc {
+namespace {
+
+sk_sp<SkPicture> CopySkPicture(const SkPicture* picture) {
+  SkDynamicMemoryWStream write_stream;
+  picture->serialize(&write_stream, nullptr);
+  DCHECK_GT(write_stream.bytesWritten(), 0u);
+
+  sk_sp<SkData> data(write_stream.copyToData());
+
+  SkMemoryStream read_stream(data);
+  return SkPicture::MakeFromStream(&read_stream, nullptr);
+}
+
+}  // namespace
+
+FakePictureCacheModel::FakePictureCacheModel() {}
+
+FakePictureCacheModel::~FakePictureCacheModel() {}
+
+void FakePictureCacheModel::AddPicture(const SkPicture* picture) {
+  sk_sp<SkPicture> picture_copy = CopySkPicture(picture);
+  pictures_.insert(std::make_pair(picture->uniqueID(), picture_copy));
+}
+
+sk_sp<const SkPicture> FakePictureCacheModel::GetPicture(uint32_t unique_id) {
+  if (pictures_.find(unique_id) == pictures_.end())
+    return nullptr;
+
+  return pictures_.find(unique_id)->second;
+}
+
+FakeEnginePictureCache::FakeEnginePictureCache(FakePictureCacheModel* model)
+    : model_(model) {}
+
+FakeEnginePictureCache::~FakeEnginePictureCache() {}
+
+void FakeEnginePictureCache::MarkPictureForUnregistration(
+    const SkPicture* picture) {}
+
+void FakeEnginePictureCache::MarkPictureForRegistration(
+    const SkPicture* picture) {
+  if (model_)
+    model_->AddPicture(picture);
+}
+
+PictureCacheUpdate FakeEnginePictureCache::CalculateCacheUpdateAndFlush() {
+  return PictureCacheUpdate();
+}
+
+FakeClientPictureCache::FakeClientPictureCache(FakePictureCacheModel* model)
+    : model_(model) {}
+
+FakeClientPictureCache::~FakeClientPictureCache() {}
+
+sk_sp<const SkPicture> FakeClientPictureCache::GetPicture(uint32_t unique_id) {
+  if (!model_)
+    return nullptr;
+
+  return model_->GetPicture(unique_id);
+}
+
+void FakeClientPictureCache::ApplyCacheUpdate(
+    const PictureCacheUpdate& cache_update) {}
+
+void FakeClientPictureCache::Flush() {}
+
+void FakeClientPictureCache::MarkPictureForUnregistration(
+    uint32_t engine_picture_id) {}
+
+void FakeClientPictureCache::MarkPictureForRegistration(
+    uint32_t engine_picture_id) {}
+
+}  // namespace cc