GitLab

After this should be better for Braille output, easier to predict for speech, and more accurately represents the format. 
For example 2 links on separate lines of HTML source will have a whitespace node between them -- this is rendered on the screen but until this CL did not show up in the a11y tree.
It also corrects the word boundary algorithm so that the start of a word does not occur in a whitespace-only node. ChromeVox's move-by-word algorithm was adjusted to be able to find the next node when the current one did not have a word stop.

Bug: None
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I4f7aa1624a2b5f7efb3d957656ec0b11fcc2a9af
Reviewed-on: https://chromium-review.googlesource.com/657561Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501625}