[Impeller] Add matrix backdrop filter golden. (flutter/engine#43484)

Adds an Aiks golden to demonstrate issues with using
MatrixFilterContents as a backdrop filter.

engine/src/flutter/impeller/aiks/aiks_unittests.cc

@@ -2851,5 +2851,21 @@ TEST_P(AiksTest, CanCanvasDrawPicture) {
   ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
 }
 
+TEST_P(AiksTest, MatrixBackdropFilter) {
+  Canvas canvas;
+  canvas.SaveLayer({}, std::nullopt,
+                   [](const FilterInput::Ref& input,
+                      const Matrix& effect_transform, bool is_subpass) {
+                     return FilterContents::MakeMatrixFilter(
+                         input, Matrix::MakeTranslation(Vector2(100, 100)), {},
+                         Matrix(), true);
+                   });
+  canvas.DrawCircle(Point(100, 100), 100,
+                    {.color = Color::Green(), .blend_mode = BlendMode::kPlus});
+  canvas.Restore();
+
+  ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
+}
+
 }  // namespace testing
 }  // namespace impeller