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Some accelerators don't make sense if no windows exist on the desktop.
ChromeVox users can end up in this state and not know it.
If a window-needing accelerator is issued and there is no window we
fire off an accessibiliy event to let the user know there is no
window.
This CL:
Extends Ash's AcceleratorController to intercept these accelerators.
Adds the concept of triggering an alert to AccessibilityDelegate.
Adds handling in Chrome's AccessibilityDelegate to generate an alert.
BUG=217571
TEST=All automated tests pass. Activate ChromeVox and hit ctrl-m with
no window open on Chrome OS. You should get an alert telling you to
open a window.
Review URL: https://codereview.chromium.org/77453013
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236812 0039d316-1c4b-4281-b951-d872f2087c98
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