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Blink currently does not properly render MathML but allows authors to specify
fallback content via an annotation child of the <semantics> element. This is
implemented by CSS rules in a dedicated UA sheet. This CL adds a
mathml-fallback.css UA sheet with the same CSS rules and uses it when
MathMLCore is disabled, in order to preserve existing behavior in that case.
When MathMLCore is enabled, the existing mathml.css UA sheet is still used
for now but its content will be modified in future CLs when the MathML
implementation is refined.

Bug: 6606

Change-Id: I4d68f10185d7e25f64bffeee0da5a184fac39932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904186Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Frédéric Wang <fwang@igalia.com>
Commit-Queue: Rob Buis <rbuis@igalia.com>
Cr-Commit-Position: refs/heads/master@{#713907}