Verify accounting for loop counts in Gif and WebP assets is consistent. (flutter#14321)

Asserts that the Skia fix is pulled into Flutter Engine https://skia-review.googlesource.com/c/skia/+/259161. This should have happened in flutter/engine#14315.

Fixes flutter#46289
Fixes flutter#45246

Author: chinmaygarde

ci/licenses_golden/licenses_flutter

@@ -269,6 +269,8 @@ FILE: ../../../flutter/lib/ui/dart_ui.h
 FILE: ../../../flutter/lib/ui/dart_wrapper.h
 FILE: ../../../flutter/lib/ui/fixtures/DashInNooglerHat.jpg
 FILE: ../../../flutter/lib/ui/fixtures/Horizontal.jpg
+FILE: ../../../flutter/lib/ui/fixtures/hello_loop_2.gif
+FILE: ../../../flutter/lib/ui/fixtures/hello_loop_2.webp
 FILE: ../../../flutter/lib/ui/fixtures/ui_test.dart
 FILE: ../../../flutter/lib/ui/geometry.dart
 FILE: ../../../flutter/lib/ui/hash_codes.dart

lib/ui/BUILD.gn

@@ -155,6 +155,8 @@ if (current_toolchain == host_toolchain) {
     fixtures = [
       "fixtures/DashInNooglerHat.jpg",
       "fixtures/Horizontal.jpg",
+      "fixtures/hello_loop_2.gif",
+      "fixtures/hello_loop_2.webp",
     ]
   }
 

lib/ui/fixtures/hello_loop_2.gif

@@ -9,6 +9,7 @@
 #include "flutter/testing/test_gl_surface.h"
 #include "flutter/testing/testing.h"
 #include "flutter/testing/thread_test.h"
+#include "third_party/skia/include/codec/SkCodec.h"
 
 namespace flutter {
 namespace testing {
@@ -496,5 +497,27 @@ TEST_F(ImageDecoderFixtureTest, CanResizeWithoutDecode) {
   latch.Wait();
 }
 
+// Verifies https://skia-review.googlesource.com/c/skia/+/259161 is present in
+// Flutter.
+TEST(ImageDecoderTest,
+     VerifyCodecRepeatCountsForGifAndWebPAreConsistentWithLoopCounts) {
+  auto gif_mapping = OpenFixtureAsSkData("hello_loop_2.gif");
+  auto webp_mapping = OpenFixtureAsSkData("hello_loop_2.webp");
+
+  ASSERT_TRUE(gif_mapping);
+  ASSERT_TRUE(webp_mapping);
+
+  auto gif_codec = SkCodec::MakeFromData(gif_mapping);
+  auto webp_codec = SkCodec::MakeFromData(webp_mapping);
+
+  ASSERT_TRUE(gif_codec);
+  ASSERT_TRUE(webp_codec);
+
+  // Both fixtures have a loop count of 2 which should lead to the repeat count
+  // of 1
+  ASSERT_EQ(gif_codec->getRepetitionCount(), 1);
+  ASSERT_EQ(webp_codec->getRepetitionCount(), 1);
+}
+
 }  // namespace testing
 }  // namespace flutter