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Provide friendly-sounding suggestions that are more efficient for screen reader use.
For example, read the title of a document before the URL. An example of a friendly
suggestion would be "Gmail https://mail.google.com location from history".

In order to get the friendly suggestions to be announce or shown on a Braille display,
the textfield's accessible text value is replaced with the friendly text, rather than
containing the URL only. If the user begins to edit the text or arrow through it, the
accessible text/value is returned to the plain URL or search text.

In addition, incoming and outgoing cursor/selection offsets are corrected so that
assistive technologies can set the location of the cursor (for cursor routing),
or retrieve the actual text at the current caret position. The caret/selection
indices are offset by the amount of friendly text inserted before the actual
text being shown in the text box.

Bug: 785436
Change-Id: I7fb9071c2df1a4ab188bc8e7b7001396578b1950
Reviewed-on: https://chromium-review.googlesource.com/784591
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521769}