Support multi-line braille in the virtual braille display.

chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js b/chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js
index 34ff72bf5f3f6097f840e2903dc23d76ab8aa9d8..7ada5df5de49b4d97cb9ac4199b2e764e9f4fe87 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/background/prefs.js
@@ -61,6 +61,7 @@ cvox.ChromeVoxPrefs = function() {
 cvox.ChromeVoxPrefs.DEFAULT_PREFS = {
   'active': true,
   'brailleCaptions': false,
+  'brailleSideBySide': true,
   // TODO(dtseng): Leaking state about multiple key maps here until we have a
   // class to manage multiple key maps. Also, this doesn't belong as a pref;
   // should just store in local storage.
@@ -70,6 +71,7 @@ cvox.ChromeVoxPrefs.DEFAULT_PREFS = {
   'focusFollowsMouse': false,
   'granularity': undefined,
   'position': '{}',
+  'siteSpecificEnhancements': true,
   'siteSpecificScriptBase':
       'https://ssl.gstatic.com/accessibility/javascript/ext/',
   'siteSpecificScriptLoader':
@@ -78,8 +80,9 @@ cvox.ChromeVoxPrefs.DEFAULT_PREFS = {
   'typingEcho': 0,
   'useIBeamCursor': cvox.ChromeVox.isMac,
   'useVerboseMode': true,
-  'siteSpecificEnhancements': true,
-  'useNext': true
+  'useNext': true,

[dmazzoni, 2016/10/28 06:19:29]

Thanks for rearranging these, but if you're sorting them alphabetically this
should probably go before useVerboseMode

[ultimatedbz, 2016/10/28 18:45:35]

Done.

+  'virtualBrailleRows': 1,
+  'virtualBrailleColumns': 40
 };