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This is the final CL to add support for Android SuggestionSpans (at least ones
not marked with FLAG_MISSPELLING; there will be one or more additional CLs to
add support for those). This CL includes:

- Changes to ImeAdapter to make it pass SuggestionSpans into
  InputMethodController

- Changes to InputMethodController to make it create suggestion markers from the
  passed-in SuggestionSpans

- Additional methods in TextSuggestionController for getting the list of text
  suggestions under the cursor, and applying a suggestion

- More Mojo code to pass information about text suggestions back-and-forth
  between browser and renderer code

- Changes to SuggestionsPopupWindow and TextSuggestionHost so we can show either
  a spell check or a text suggestion menu

Bug: 672259
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I3f30543586901baec4648d265874a303efafbd44
Reviewed-on: https://chromium-review.googlesource.com/627172
Commit-Queue: Ryan Landay <rlanday@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Alexandre Elias <aelias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501335}