Set sRGB flag for PNGs with an sRGB chunk

src/codec/SkPngCodec.cpp

Index: src/codec/SkPngCodec.cpp
diff --git a/src/codec/SkPngCodec.cpp b/src/codec/SkPngCodec.cpp
index 232373c04407c63c2b391c148a7053db9e9d62e9..656df7da0b837f868a4b32732f3d972ae606584d 100644
--- a/src/codec/SkPngCodec.cpp
+++ b/src/codec/SkPngCodec.cpp
@@ -328,10 +328,13 @@ static bool read_header(SkStream* stream, SkPngChunkReader* chunkReader,
         *numberPassesPtr = numberPasses;
     }
 
-    // FIXME: Also need to check for sRGB ( https://bug.skia.org/3471 ).
+    SkColorProfileType profileType = kLinear_SkColorProfileType;
+    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sRGB)) {
+        profileType = kSRGB_SkColorProfileType;
+    }
 
     if (imageInfo) {
-        *imageInfo = SkImageInfo::Make(origWidth, origHeight, colorType, alphaType);
+        *imageInfo = SkImageInfo::Make(origWidth, origHeight, colorType, alphaType, profileType);
     }
     autoClean.detach();
     if (png_ptrp) {