add SK_SUPPORT_LEGACY_SHADERBITMAPTYPE for future skia API refactor
add SK_SUPPORT_LEGACY_SHADERBITMAPTYPE for future skia API refactor

https://codereview.chromium.org/1287263005#

BUG=

Review URL: https://codereview.chromium.org/1302473003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#344262}

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