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This CL is refactoring the way codepoints are rewritten
for the conversion between text to layout_text.

There is an invariant that must hold:
  * Same amount of codepoint
The text size may differ and text indexes are not the same.

This CL is proposing to use a map function to replace
codepoints. This avoid error-prone custom codepoints
replacement.

Bug: 1022893
Change-Id: Ic1fcdfe6b34a1bf1dd47f0ee6a5e157bd131d0ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1908447
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715157}