Set desired_image_size when decoding images for NTP Tile icons.

services/image_decoder/image_decoder_impl_unittest.cc

Index: services/image_decoder/image_decoder_impl_unittest.cc
diff --git a/services/image_decoder/image_decoder_impl_unittest.cc b/services/image_decoder/image_decoder_impl_unittest.cc
index a04f21d30926a16cab5b033972daa29fc48ec973..f75e8ec249f6fbc63248c4c75d52020d412f303c 100644
--- a/services/image_decoder/image_decoder_impl_unittest.cc
+++ b/services/image_decoder/image_decoder_impl_unittest.cc
@@ -53,6 +53,7 @@ class Request {
   void DecodeImage(const std::vector<unsigned char>& image, bool shrink) {
     decoder_->DecodeImage(
         image, mojom::ImageCodec::DEFAULT, shrink, kTestMaxImageSize,
+        gfx::Size(),  // Take the smallest frame (there's only one frame).
         base::Bind(&Request::OnRequestDone, base::Unretained(this)));
   }