change pixel-serializer to support reencoding existing data

Trying to evolve this interface so it can
- support rich set of backend-encoders (including ones like ETC1 that can cheaply convert to KXT
- allow for encoding images as well as bitmaps (e.g. for picture serialization)
- perhaps replace SkImageEncoder as an API (assuming we create a factory that returns a serializer given a format)

BUG=skia:

Review URL: https://codereview.chromium.org/1373683003

1 files changed, 0 insertions, 1 deletions

diff --git a/tools/sk_tool_utils.h b/tools/sk_tool_utils.h
index b20c60ba76..d8709cc71e 100644
--- a/tools/sk_tool_utils.h
+++ b/tools/sk_tool_utils.h
@@ -115,7 +115,6 @@ namespace sk_tool_utils {
     // used.
     class PngPixelSerializer : public SkPixelSerializer {
     public:
-        bool onUseEncodedData(const void*, size_t) override { return true; }
         SkData* onEncodePixels(const SkImageInfo& info, const void* pixels,
                                size_t rowBytes) override {
             return SkImageEncoder::EncodeData(info, pixels, rowBytes,