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1. alt+left/right

Chrome only fires focus events in this case. This change tries to
recover focus whenever a focus event gets fired on a root web area. The
challenge here is the root node gets re-used. Explicit tracking of the
docurl gets introduced as a result.

Forum discussion:
https://groups.google.com/forum/#!topic/axs-chrome-discuss/u9gcqZxDISM

2. toggle on ChromeVox

In this case, ChromeVox tries to always recover focus. Detected by
checking there is no |currentRange|.

3. ctrl+r

In this case, ChromeVox receives a load complete. Only recover if the
|focus| is not already inside of the page (i.e. |focus| is the top level
root).

restores its range appropriately.

Test: exercise each of the above examples; verify that ChromeVox
Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I6e427105555b2663dca1100a02b8eb6b00cdc08a
Reviewed-on: https://chromium-review.googlesource.com/806759
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521909}