Various changes required to support ChromeVox Next to read Views and Windows.

- adds support for valueChanged event (e.g. to read adjustment of the volume slider)
- add textChanged event handler to process omnibox character echo/deletion.
- braille support for the textChanged,textSelectionChanged events
- whitelist ChromeVox for automation API up to stable.
- remove the --enable-chromevox-next cmd line flag.
- adds options for Output module (to only output braille, for example).
- adds a "dummy" alert window as a child of the desktop root node; this window will be used to fire alert events. Due to the way we support alerts now without backing views, this is necessary.
- start generating context for window on "enter". This picks up announcements like "status tray" when entering the status tray bar with alt+shift+s.
- exclude the first child (only child) of the desktop node from having a name set; this is because that particular window has a non-human readable name "Display<xxx>" which gets read frequently when entering a screen/display.

Review URL: https://codereview.chromium.org/743273002

Cr-Commit-Position: refs/heads/master@{#306855}

1 files changed, 0 insertions, 1 deletions

diff --git a/chromeos/chromeos_switches.h b/chromeos/chromeos_switches.h
index 8bc5aa2..275082f 100644
--- a/chromeos/chromeos_switches.h
+++ b/chromeos/chromeos_switches.h
@@ -43,7 +43,6 @@ CHROMEOS_EXPORT extern const char kDisableOfficeEditingComponentApp[];
 CHROMEOS_EXPORT extern const char kDisableRollbackOption[];
 CHROMEOS_EXPORT extern const char kDisableVolumeAdjustSound[];
 CHROMEOS_EXPORT extern const char kEnableCarrierSwitching[];
-CHROMEOS_EXPORT extern const char kEnableChromeVoxNext[];
 CHROMEOS_EXPORT extern const char kEnableCloudBackup[];
 CHROMEOS_EXPORT extern const char kEnableConsumerManagement[];
 CHROMEOS_EXPORT extern const char kEnableEmbeddedSignin[];