Use CTFontCreateForString for RenderTextHarfbuzz on Mac
The approach ends up pretty close to what's already done for Windows.
On Mac, CTFontCreateForString() gives better fallbacks (i.e. they more
often match what native UI does) and requires RenderTextHarfbuzz to do
less work. However, it doesn't guarantee that the returned font can
display every glyph in the provided string.
So still use CTFontCopyDefaultCascadeListForLanguages (which is now a
public API - hooray) to provide a last-resort list of fallback fonts.
This CL causes a font used for Hebrew text in a test to change, which
tickled a pre-existing bug/corner case in the test for some macOS
versions.
BUG=696867, 619684, 735346
Previously landed in r481062, but tickled some OS-specific tests due to
a valid discrepancy between rounding directions.
Review-Url: https://codereview.chromium.org/2927953003
Cr-Commit-Position: refs/heads/master@{#481764}
7 files changed
