Merge text from all changes to the same live region into one utterance.

chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
index 11e469898db788c9bfc4a79729d94eac2a1f7214..baaa6ae3319c3880f890a611bf6d774651d87222 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
@@ -412,6 +412,30 @@ cvox.LiveRegions.announceChange = function(
     }
   });
 
+  // TODO(dmazzoni): http://crbug.com/415679 Temporary design decision;
+  // until we have a way to tell the speech queue to group the nav
+  // descriptions together, collapse them into one.
+  // Otherwise, one nav description could be spoken, then something unrelated,
+  // then the rest.
+  if (navDescriptions.length > 1) {
+    var allStrings = [];
+    navDescriptions.forEach(function(desc) {
+      if (desc.context) {
+        allStrings.push(desc.context);
+      }
+      if (desc.text) {
+        allStrings.push(desc.text);
+      }
+      if (desc.userValue) {
+        allStrings.push(desc.userValue);
+      }
+    });
+    navDescriptions = [new cvox.NavDescription({
+      text: allStrings.join(', '),
+      category: 'live'
+    })];
+  }
+
   handler(assertive, navDescriptions);
 };