SkPixelSerializer: remove deprecated virtual

tools/sk_tool_utils.cpp

Index: tools/sk_tool_utils.cpp
diff --git a/tools/sk_tool_utils.cpp b/tools/sk_tool_utils.cpp
index e2bc0fc42cfb17e284335972234d0c41a043eb18..8c3097602c98af55b38295639be525864321fa54 100644
--- a/tools/sk_tool_utils.cpp
+++ b/tools/sk_tool_utils.cpp
@@ -222,6 +222,19 @@ SkBitmap create_string_bitmap(int w, int h, SkColor c, int x, int y,
     return bitmap;
 }
 
+bool PngPixelSerializer::onUseEncodedData(const void*, size_t) { return true; }
+SkData* PngPixelSerializer::onEncode(const SkPixmap& pixmap) {
+    SkBitmap bm;
+    if (!bm.installPixels(pixmap.info(),
+                          const_cast<void*>(pixmap.addr()),
+                          pixmap.rowBytes(),
+                          pixmap.ctable(),
+                          nullptr, nullptr)) {
+        return nullptr;
+    }
+    return SkImageEncoder::EncodeData(bm, SkImageEncoder::kPNG_Type, 100);
+}
+
 void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
                       SkScalar x, SkScalar y) {
     SkPaint paint(origPaint);