We want to let the facilitator decide if a word is valid or invalid, and cache
the answer in the facilitator's cache. The spell checker session doesn't need
its own word cache, except as a crutch to communicate suggestions to the code
that populates the suggestion drop-down. We leave that in place.

Bug 20018546.

Change-Id: I3c3c53e0c1d709fa2f64a2952a232acd7380b57a

Bug: 18108776
Change-Id: I43feb25d79f89276d44462ba71788a14c4583277

This CL also adds @SuppressWarning("unused" to java-overridable package.

Bug: 18003991
Change-Id: If70527e30654384705d7a814f5efd181d9f539e1

Bug: 14425059
Change-Id: Id06a71681fa8b5e589e29fba10fe5c1cfed66984

Bug: 16530557
Change-Id: I271c5884995a1d5f8a1cb7aee6f52d17fabb9e72

This is a ground work to take per word locale information into
consideration in the spell checker. This CL is supposed to change
no user visible behavior.

With this CL, the spell checker session is able to read span
information if necessary.

BUG: 16029304
Change-Id: Icb1e1ecdf40fe0445e14565b685b1b878b746210

Bug: 13689011
Bug: 13630847
Change-Id: I9930d5ce9cbe16489dc69f68b9590d72afe463b5

Bug: 14425059
Change-Id: I2bd6a872904a44b80f638a13d91a97559217cc1a

The framework's default split is not suitable for all
languages. Also it does not perform very well when space
is mistyped as period.

Bug: 9063355
Bug: 10780091
Change-Id: I400d790ff1c29f221697fd94d79bbf67c61c7b8a

Change-Id: If16ef50ae73147594615d0f49d6a22621eaf1aef

Bug: 14119293
Bug: 14425059

Change-Id: I3d5da84881a49a04550180dd9aac2c37da2ed762

Change-Id: I1c5b27c8edf231680edb8d96f63b9d04cfc6a6fa

Bug: 8161354
Change-Id: I17c23f56dd3bc2f27726556bf2c5a9d5520bd172

Change-Id: Ic56167f952a7f4449da366e1e81610e72c966086

Change-Id: I6009b3c1950ba32b7f1e205a3db2307fe0cd688e

Change-Id: I6b4de9187e122298e5e9cd8ddc9070d062df6a89

Bug: 6789576
Change-Id: Ia768258f6fa121c7a7757093eb8a20e665580865

Bug: 6789576
Change-Id: I6de1e1aa64cf14f38ecb250579418bc518f0d838

Bug: 6789576
Change-Id: I7c55d36afad7ef6046353b3c9e849a54a6dc83ae