GIF: Fill the frame if we have a dummy color table

src/codec/SkGifCodec.cpp

Index: src/codec/SkGifCodec.cpp
diff --git a/src/codec/SkGifCodec.cpp b/src/codec/SkGifCodec.cpp
index 263004b6cdea084ba93004dbc2fa4d0a71804a1c..1ede918657503a0e9d41321574b15eecd2bb4642 100644
--- a/src/codec/SkGifCodec.cpp
+++ b/src/codec/SkGifCodec.cpp
@@ -298,9 +298,11 @@ SkCodec::Result SkGifCodec::decodeFrame(bool firstAttempt, const Options& opts,
             // - The frame is interlaced. There is no obvious way to fill
             //   afterwards for an incomplete image. (FIXME: Does the first pass
             //   cover all rows? If so, we do not have to fill here.)
+            // - There is no color table for this frame. In that case will not
+            //   draw anything, so we need to fill.
             if (frameContext->frameRect() != this->getInfo().bounds()
                     || frameContext->transparentPixel() < SK_MAX_COLORS
-                    || frameContext->interlaced()) {
+                    || frameContext->interlaced() || !fCurrColorTableIsReal) {
                 // fill ignores the width (replaces it with the actual, scaled width).
                 // But we need to scale in Y.
                 const int scaledHeight = get_scaled_dimension(dstInfo.height(),