Reduce size of LinearBitmapPipeline from 281K to 134K, but keep the same speed.

Speed checked using top25desk SKPS.

Size measured using:
 llvm-nm-3.6  -print-file-name  -print-size -U out/Release/libskia_core.a | awk '{totals[$1] += strtonum("0x" $3)} END { for (i in totals) {print totals[i], i}}' | sort -n | column -t

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2100323002

Review-Url: https://codereview.chromium.org/2100323002
5 files changed