Assign sRGB color space to unmarked jpegs and pngs

src/codec/SkPngCodec.cpp

Index: src/codec/SkPngCodec.cpp
diff --git a/src/codec/SkPngCodec.cpp b/src/codec/SkPngCodec.cpp
index 84d25752250c0bc37b40cca9f39df2f9dfa73817..43d1580c176b0b0cfff9b3fda103fd6627f0b765 100644
--- a/src/codec/SkPngCodec.cpp
+++ b/src/codec/SkPngCodec.cpp
@@ -608,6 +608,11 @@ static bool read_header(SkStream* stream, SkPngChunkReader* chunkReader, SkCodec
 
     if (outCodec) {
         sk_sp<SkColorSpace> colorSpace = read_color_space(png_ptr, info_ptr);
+        if (!colorSpace) {
+            // Treat unmarked pngs as sRGB.
+            colorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
+        }
+
         SkEncodedInfo info = SkEncodedInfo::Make(color, alpha, 8);
 
         if (1 == numberPasses) {