[Impeller] added test for bgra10xr png encoding (flutter#53182)

fixes: flutter/flutter#148851
depends on: 
 - https://skia-review.googlesource.com/c/skcms/+/861638
 - https://skia-review.googlesource.com/c/skia/+/861516

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide] and the [C++,
Objective-C, Java style guides].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I added new tests to check the change I am making or feature I am
adding, or the PR is [test-exempt]. See [testing the engine] for
instructions on writing and running engine tests.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I signed the [CLA].
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#overview
[Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene
[test-exempt]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[C++, Objective-C, Java style guides]:
https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
[testing the engine]:
https://github.com/flutter/flutter/wiki/Testing-the-engine
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes
[Discord]: https://github.com/flutter/flutter/wiki/Chat

lib/ui/painting/image_encoding_unittests.cc

@@ -469,6 +469,28 @@ TEST(ImageEncodingImpellerTest, PngEncoding10XR) {
   EXPECT_TRUE(png.ok());
 }
 
+TEST(ImageEncodingImpellerTest, PngEncodingBGRA10XR) {
+  int width = 100;
+  int height = 100;
+  SkImageInfo info = SkImageInfo::Make(
+      width, height, kBGRA_10101010_XR_SkColorType, kUnpremul_SkAlphaType);
+
+  auto surface = SkSurfaces::Raster(info);
+  SkCanvas* canvas = surface->getCanvas();
+
+  SkPaint paint;
+  paint.setColor(SK_ColorBLUE);
+  paint.setAntiAlias(true);
+
+  canvas->clear(SK_ColorWHITE);
+  canvas->drawCircle(width / 2, height / 2, 100, paint);
+
+  sk_sp<SkImage> image = surface->makeImageSnapshot();
+
+  fml::StatusOr<sk_sp<SkData>> png = EncodeImage(image, ImageByteFormat::kPNG);
+  EXPECT_TRUE(png.ok());
+}
+
 #endif  // IMPELLER_SUPPORTS_RENDERING
 
 }  // namespace testing