Never consolidate data in ICO decoder

Source/platform/image-decoders/png/PNGImageDecoder.h

Index: Source/platform/image-decoders/png/PNGImageDecoder.h
diff --git a/Source/platform/image-decoders/png/PNGImageDecoder.h b/Source/platform/image-decoders/png/PNGImageDecoder.h
index 7f54c2e360725981b96c9c96ce4cb6b331a77995..88257407ad046bddc34f8fd5f60a1b724d96514e 100644
--- a/Source/platform/image-decoders/png/PNGImageDecoder.h
+++ b/Source/platform/image-decoders/png/PNGImageDecoder.h
@@ -37,7 +37,7 @@ class PNGImageReader;
 class PLATFORM_EXPORT PNGImageDecoder : public ImageDecoder {
     WTF_MAKE_NONCOPYABLE(PNGImageDecoder);
 public:
-    PNGImageDecoder(AlphaOption, GammaAndColorProfileOption, size_t maxDecodedBytes);
+    PNGImageDecoder(AlphaOption, GammaAndColorProfileOption, size_t maxDecodedBytes, unsigned offset = 0);
     ~PNGImageDecoder() override;
 
     // ImageDecoder:
@@ -61,6 +61,7 @@ private:
 
     OwnPtr<PNGImageReader> m_reader;
     bool m_hasColorProfile;
+    const unsigned m_offset;
 };
 
 } // namespace blink