Revert of Revert of Add test for ChromeVox keyboard commands. (patchset #1 id:1 of https://codereview.chromium.org/603823002/)

Reason for revert:
sorry I reverted this incorrectly, the problem was that the isolate needed a nacl file. I'm not sure why it only needed it on debug cros and not release. I landed it in https://codereview.chromium.org/597283004/

Original issue's description:
> Revert of Add test for ChromeVox keyboard commands. (patchset #21 id:390004 of https://codereview.chromium.org/490443002/)
>
> Reason for revert:
> flakes, see http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/31850
>
> failures:
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxPrefixKey/0
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxPrefixKey/1
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxShiftSearch/1
> TestAsNormalAndGuestUser/SpokenFeedbackTest.ChromeVoxShiftSearch/0
> LoggedInSpokenFeedbackTest.AddBookmark
>
> Original issue's description:
> > Add test for ChromeVox keyboard commands.
> >
> > This is just a couple of quick sanity checks to prevent future regressions
> > like the one in the linked bug. It tests both a Search+Shift shortcut and
> > the corresponding Prefix Key shortcut.
> >
> > Adds support for sending the meta modifier key in
> > aura/x11 tests.
> >
> > BUG=404470
> >
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291547
> >
> > Committed: https://chromium.googlesource.com/chromium/src/+/8cab2737f1cb6e6011b0946f6bef5027868602c0
> >
> > Committed: https://crrev.com/91703961c10dfa0f452999ed7cb87945ea817362
> > Cr-Commit-Position: refs/heads/master@{#293687}
> >
> > Committed: https://crrev.com/15ea141544fedaf306c94890b5be19b7c5df885a
> > Cr-Commit-Position: refs/heads/master@{#296074}
>
> TBR=dtseng@chromium.org,sky@chromium.org,dmazzoni@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=404470
>
> Committed: https://crrev.com/14e5bdf573d0621dfdd553888a5d3c557fb699a0
> Cr-Commit-Position: refs/heads/master@{#296627}

TBR=dtseng@chromium.org,sky@chromium.org,dmazzoni@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404470

Review URL: https://codereview.chromium.org/600373002

Cr-Commit-Position: refs/heads/master@{#296670}
2 files changed