4x4.png -> 2x2.png; this file is actually 2x2 (flutter#20005)

* 4x4.png -> 2x2.png; this file is actually 2x2

testing/dart/encoding_test.dart

@@ -114,7 +114,7 @@ class GrayscaleImage {
   GrayscaleImage._();
 
   static Future<Image> load() async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Completer<Image> completer = Completer<Image>();
     decodeImageFromList(bytes, (Image image) => completer.complete(image));
     return await completer.future;

testing/dart/image_descriptor_test.dart

@@ -13,7 +13,7 @@ import 'package:test/test.dart';
 
 void main() {
   test('basic image descriptor - encoded - greyscale', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final ImmutableBuffer buffer = await ImmutableBuffer.fromUint8List(bytes);
     final ImageDescriptor descriptor = await ImageDescriptor.encoded(buffer);
 

testing/dart/image_resize_test.dart

@@ -19,7 +19,7 @@ void main() {
   }());
 
   test('no resize by default', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
     final int codecHeight = frame.image.height;
@@ -29,7 +29,7 @@ void main() {
   });
 
   test('resize width with constrained height', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes, targetHeight: 1);
     final FrameInfo frame = await codec.getNextFrame();
     final int codecHeight = frame.image.height;
@@ -39,7 +39,7 @@ void main() {
   });
 
   test('resize height with constrained width', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes, targetWidth: 1);
     final FrameInfo frame = await codec.getNextFrame();
     final int codecHeight = frame.image.height;
@@ -49,7 +49,7 @@ void main() {
   });
 
   test('upscale image by 5x', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes, targetWidth: 10, allowUpscaling: true);
     final FrameInfo frame = await codec.getNextFrame();
     final int codecHeight = frame.image.height;
@@ -59,7 +59,7 @@ void main() {
   });
 
   test('upscale image by 5x - no upscaling', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec = await instantiateImageCodec(bytes, targetWidth: 10, allowUpscaling: false);
     final FrameInfo frame = await codec.getNextFrame();
     final int codecHeight = frame.image.height;
@@ -69,7 +69,7 @@ void main() {
   });
 
   test('upscale image varying width and height', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec =
         await instantiateImageCodec(bytes, targetWidth: 10, targetHeight: 1, allowUpscaling: true);
     final FrameInfo frame = await codec.getNextFrame();
@@ -80,7 +80,7 @@ void main() {
   });
 
   test('upscale image varying width and height - no upscaling', () async {
-    final Uint8List bytes = await readFile('4x4.png');
+    final Uint8List bytes = await readFile('2x2.png');
     final Codec codec =
         await instantiateImageCodec(bytes, targetWidth: 10, targetHeight: 1, allowUpscaling: false);
     final FrameInfo frame = await codec.getNextFrame();