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When creating symbol diffs, mismatches in alias counts and summing
fractional padding PSS values can lead to DiffSymbols with non-integer
padding values. However, numeric values in .sizediff files should be
integers. This CL implements a simple fix: Round paddings to integer
when creating DiffSymbols. The resulting inaccuracy would be in the
order of bytes, and therefore negligible.

Bug: 1132394
Change-Id: Iba9acb0a94de6890aec01ac6c9ee450fb9d69dd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432668
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810827}