Fill incomplete images in SkCodec parent class

src/codec/SkCodec_libico.cpp

Index: src/codec/SkCodec_libico.cpp
diff --git a/src/codec/SkCodec_libico.cpp b/src/codec/SkCodec_libico.cpp
index 798169d82b344902571d996d34c127818b3576e7..f0306947e86976c84b968b6d6554a4a15f49e403 100644
--- a/src/codec/SkCodec_libico.cpp
+++ b/src/codec/SkCodec_libico.cpp
@@ -133,6 +133,9 @@ SkCodec* SkIcoCodec::NewFromStream(SkStream* stream) {
                 SkData::NewFromStream(inputStream.get(), size));
         if (nullptr == data.get()) {
             SkCodecPrintf("Warning: could not create embedded stream.\n");
+            // FIXME: This is a good solution if we have already created at
+            // least one valid codec.  Otherwise, we may want to try to
+            // partially decode this incomplete embedded image.
             break;
         }
         SkAutoTDelete<SkMemoryStream> embeddedStream(new SkMemoryStream(data.get()));