Move ComputeTextRects before Range::BoundingBox()
Currently textQuads and ComputeTextRects algorithm is
mostly same. The difference of behaviour of these two functions
can be handled efficiently by using templates.

This patch is the first step to achieve above behaviour.
This patch removes the TODO comment and forward declaration of
computeTextRects.

BUG=691198

Review-Url: https://codereview.chromium.org/2827603006
Cr-Commit-Position: refs/heads/master@{#466607}
1 file changed