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Looks like buffers are not fully used and whitespace_buffer are used
only for some calls. It seems possible to avoid using attribute, and
have less buffers on stack, but it's going to be a bigger change.

https://pinpoint-dot-chromeperf.appspot.com/job/12124259620000

Bug: 1055709
Change-Id: I8f98b12d0d3db46961e48aba2284acf7481c359f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094237
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748155}