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Bookmark folders using Views are very janky (~5 fps, with the CPU
at 100%). Calls to RenderTextHarfBuzz::ShapeRunWithFont account for
almost all of this time.

Many of the calls to ShapeRunWithFont are done with the same arguments
every frame. To alleviate some of this jank, add a cache the results of
this function call.

Refactor RenderTextHarfBuzz::ShapeRunWithFont to be stateless, and add
structures ShapeRunWithFontInput and ShapeRunWithFontOutput for the
arguments and output of the function. Use ShapeRunWithFontInput as
a cache key.

Bug: 826265
Change-Id: Ic6726c1152c44dc5cb0eccddf1ff3adcd060d8e7
Reviewed-on: https://chromium-review.googlesource.com/1123456
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572420}