[blimp] Add SkPicture caching support.

blimp/engine/renderer/blimp_engine_picture_cache_unittest.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 "blimp/test/support/compositor/picture_cache_test_support.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+
+namespace blimp {
+namespace engine {
+namespace {
+
+class BlimpEnginePictureCacheTest : public testing::Test {
+ public:
+  BlimpEnginePictureCacheTest() : cache_(nullptr) {}
+  ~BlimpEnginePictureCacheTest() override = default;
+
+ protected:
+  BlimpEnginePictureCache cache_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BlimpEnginePictureCacheTest);
+};
+
+TEST_F(BlimpEnginePictureCacheTest, TwoCachedPicturesCanBeRetrieved) {
+  EXPECT_TRUE(cache_.CalculateCacheUpdateAndFlush().empty());
+
+  sk_sp<const SkPicture> picture1 = CreateSkPicture(SK_ColorBLUE);
+  cache_.MarkUsed(picture1.get());
+  sk_sp<const SkPicture> picture2 = CreateSkPicture(SK_ColorRED);
+  cache_.MarkUsed(picture2.get());
+
+  std::vector<cc::PictureData> update = cache_.CalculateCacheUpdateAndFlush();
+  ASSERT_EQ(2U, update.size());
+  EXPECT_THAT(update, testing::UnorderedElementsAre(PictureMatches(picture1),
+                                                    PictureMatches(picture2)));
+
+  EXPECT_TRUE(cache_.CalculateCacheUpdateAndFlush().empty());
+}
+
+TEST_F(BlimpEnginePictureCacheTest, SamePictureOnlyReturnedOnce) {
+  EXPECT_TRUE(cache_.CalculateCacheUpdateAndFlush().empty());
+
+  sk_sp<const SkPicture> picture = CreateSkPicture(SK_ColorBLUE);
+  cache_.MarkUsed(picture.get());
+  cache_.MarkUsed(picture.get());
+
+  std::vector<cc::PictureData> update = cache_.CalculateCacheUpdateAndFlush();
+  ASSERT_EQ(1U, update.size());
+  EXPECT_THAT(update, testing::UnorderedElementsAre(PictureMatches(picture)));
+}
+
+}  // namespace
+}  // namespace engine
+}  // namespace blimp