AI 148692: Merge change #148679 into Cupcake, since we probably want to
take it for rel if there's an opportunity. Original
description:
Fix InputStreamReader to not drop input on buffer boundaries.
This fix takes the salient code from Harmony tip-of-tree,
though it's not a wholesale replacement of the file. In
particular, I left in the old encoding name handling as well
as one remaining "FIXME" that I don't think would have been
addressed.
BUG=1836908
Automated import of CL 148692
2 files changed