Allows endCallbacks in tts to queue up speech in the speech queue and simplify speech output logic.

chrome/browser/resources/chromeos/chromevox/host/chrome/tts.js

Index: chrome/browser/resources/chromeos/chromevox/host/chrome/tts.js
diff --git a/chrome/browser/resources/chromeos/chromevox/host/chrome/tts.js b/chrome/browser/resources/chromeos/chromevox/host/chrome/tts.js
index c23038d38c1cb7c5fcbb99d30b4f238fd91dfcd9..77e257f6b973a2ecadaabe64087d297f11b70c8b 100644
--- a/chrome/browser/resources/chromeos/chromevox/host/chrome/tts.js
+++ b/chrome/browser/resources/chromeos/chromevox/host/chrome/tts.js
@@ -97,7 +97,9 @@ cvox.ChromeTts.prototype.addBridgeListener = function() {
           var id = msg['id'];
           var func = cvox.ChromeTts.functionMap[id];
           if (func != undefined) {
-            func();
+            if (!msg['cleanupOnly']) {
+              func();
+            }
             delete cvox.ChromeTts.functionMap[id];
           }
         }