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This patch changes |EndOfWordPosition()| to utilize |TextSegments| class
to make |EndOfWordPosition()| to work with LayoutNG.

This patch also changes |GranularityAdjuster| to handle end of word position in
flat tree mapped before start of word position in DOM tree.

This patch changes following test expectations:
* third_party/WebKit/LayoutTests/fast/text/international/cjk-segmentation.html
|TextSegments| provides more context characters to ICU word breaker.
* VisibleSelectionTest.expandUsingGranularity
* ParameterizedVisibleUnitsWordTest.EndOfWordShadowDOM
Due by |PositionInFlatTree| to |Position| conversion.

Bug: 778507, 810579
Change-Id: Ie888f8b76e00386bc728a5c647aecf8f33ef7b6e
Reviewed-on: https://chromium-review.googlesource.com/1086811Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564839}