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DirectWrite will only ever give us one file - we do not need an
implementation for retrieving multiple files per IDWriteFont. In
upcoming changes for unique local font matching for src: local(...)
@font-face declarations, we need a way to retrieve the ttc index of a
matched font. Taking those two aspects into account, refactor
AddFontFiles to rely on a new method FontFilePathAndTtcIndex which
retrieves path and ttc index for a IDWriteFont. Also move helper
methods to anonymous namespace.

No functional changes to the DWriteFontProxy mojo interface, which
this DWriteFontProxyImpl implements. Implementation mostly moved
and restructured, but mostly unchanged and taken from previous
code.

Bug: 889864
Change-Id: Ida13667533eb338bb62083026ddbb386b8dcf0b2
Reviewed-on: https://chromium-review.googlesource.com/c/1371884
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615582}