Add a SkPixelSerializer SkImage encode variant

src/image/SkImage.cpp

Index: src/image/SkImage.cpp
diff --git a/src/image/SkImage.cpp b/src/image/SkImage.cpp
index 05b6d45c04a495b19f2225fab9f17ec1b4fff00a..8da495726c00f8432ff1f3b04cf1e3c0384e8178 100644
--- a/src/image/SkImage.cpp
+++ b/src/image/SkImage.cpp
@@ -13,6 +13,7 @@
 #include "SkImage_Base.h"
 #include "SkNextID.h"
 #include "SkPixelRef.h"
+#include "SkPixelSerializer.h"
 #include "SkReadPixelsRec.h"
 #include "SkString.h"
 #include "SkSurface.h"
@@ -67,6 +68,21 @@ SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const {
     return nullptr;
 }
 
+SkData* SkImage::encode(SkPixelSerializer* serializer) const {
+    if (!serializer) {
+        return this->encode();
+    }
+
+    SkBitmap bm;
+    SkAutoPixmapUnlock apu;
+    if (as_IB(this)->getROPixels(&bm) && bm.requestLock(&apu)) {
+        const SkPixmap& pmap = apu.pixmap();
+        return serializer->encodePixels(pmap.info(), pmap.addr(), pmap.rowBytes());
+    }
+
+    return nullptr;
+}
+
 SkData* SkImage::refEncoded() const {
     return as_IB(this)->onRefEncoded();
 }