Add a ShapeResultBloberizer test for mixed rotations

(follow-up to http://crrev.com/2714413003)

Adjust the mock SimpleFontData ctor (only used in ShapeResultBloberizerTest)
to allow passing custom OpenTypeVerticalData, and add a unit test for multiple
blobs/rotations construction.

Review-Url: https://codereview.chromium.org/2766373005
Cr-Commit-Position: refs/heads/master@{#459431}
3 files changed