[blimp] Add SkPicture caching support.

blimp/client/feature/compositor/blimp_client_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/client/feature/compositor/blimp_client_picture_cache.h"
+
+#include <stdint.h>
+#include <memory>
+#include <vector>
+
+#include "blimp/test/support/compositor/picture_cache_test_support.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 client {
+namespace {
+
+bool FakeImageDecoder(const void* input, size_t input_size, SkBitmap* bitmap) {

[Kevin M, 2016/06/17 17:53:37]

Turn this into a MOCK_METHOD of BlimpClientPictureCacheTest so that you can
verify that it was called?

[nyquist, 2016/06/17 21:31:43]

I could not find a good way of doing this. Mocking static method? Using
base::Bind()? But in the end, skia requires a raw function pointer, which means
I can't use base::Callback :-/

+  return true;
+}
+
+class BlimpClientPictureCacheTest : public testing::Test {
+ public:
+  BlimpClientPictureCacheTest() : cache_(&FakeImageDecoder) {}
+
+ protected:
+  BlimpClientPictureCache cache_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BlimpClientPictureCacheTest);
+};
+
+TEST_F(BlimpClientPictureCacheTest, TwoSkPicturesInCache) {
+  sk_sp<const SkPicture> picture1 = CreateSkPicture(SK_ColorBLUE);
+  sk_sp<const SkPicture> picture2 = CreateSkPicture(SK_ColorRED);
+  cc::PictureData picture1_data = CreatePictureData(picture1);
+  cc::PictureData picture2_data = CreatePictureData(picture2);
+
+  cc::PictureCacheUpdate cache_update;
+  cache_update.push_back(picture1_data);
+  cache_update.push_back(picture2_data);
+
+  cache_.ApplyCacheUpdate(cache_update);
+
+  cache_.MarkPictureForRegistration(picture1->uniqueID());
+  cache_.MarkPictureForRegistration(picture2->uniqueID());
+
+  sk_sp<const SkPicture> cached_picture1 =
+      cache_.GetPicture(picture1->uniqueID());
+  EXPECT_NE(nullptr, cached_picture1);
+  EXPECT_EQ(GetBlobId(picture1), GetBlobId(cached_picture1));
+  sk_sp<const SkPicture> cached_picture2 =
+      cache_.GetPicture(picture2->uniqueID());
+  EXPECT_NE(nullptr, cached_picture2);
+  EXPECT_EQ(GetBlobId(picture2), GetBlobId(cached_picture2));
+
+  cache_.Flush();
+}
+
+}  // namespace
+}  // namespace client
+}  // namespace blimp