Track all changed nodes during an update

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
index 4c3e3d42c0f0ba27e40f7fc29a75fa8364a1fe45..26c6cbc9fc02e5109d4c7f1ad6534cc1bc1bffd6 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
@@ -32,6 +32,7 @@ DesktopAutomationHandler = function(node) {
   /**
    * The object that speaks changes to an editable text field.
    * @type {editing.TextEditHandler}
+   * @private
    */
   this.textEditHandler_ = null;
 
@@ -72,7 +73,8 @@ DesktopAutomationHandler = function(node) {
 
       if (focus) {
         this.onFocus(
-            new chrome.automation.AutomationEvent(EventType.focus, focus));
+            new chrome.automation.AutomationEvent(
+                EventType.focus, focus, 'page'));
       }
     }).bind(this));
   }.bind(this));
@@ -84,6 +86,12 @@ DesktopAutomationHandler = function(node) {
  */
 DesktopAutomationHandler.VMIN_VALUE_CHANGE_DELAY_MS = 500;
 
+/**
+ * Controls announcement of non-user-initiated events.
+ * @type {boolean}
+ */
+DesktopAutomationHandler.announceActions = false;
+
 DesktopAutomationHandler.prototype = {
   __proto__: BaseAutomationHandler.prototype,
 
@@ -118,6 +126,10 @@ DesktopAutomationHandler.prototype = {
         ChromeVoxState.instance.currentRange.equals(prevRange))
       return;
 
+    // Decide whether to announce this event.
+    if (!DesktopAutomationHandler.announceActions && evt.eventFrom == 'action')
+      return;
+
     var output = new Output();
     output.withRichSpeech(
         ChromeVoxState.instance.currentRange, prevRange, evt.type);
@@ -187,7 +199,7 @@ DesktopAutomationHandler.prototype = {
     if (!evt.target.activeDescendant || !evt.target.state.focused)
       return;
     this.onEventDefault(new chrome.automation.AutomationEvent(
-        EventType.focus, evt.target.activeDescendant));
+        EventType.focus, evt.target.activeDescendant, evt.eventFrom));
   },
 
   /**
@@ -220,7 +232,7 @@ DesktopAutomationHandler.prototype = {
 
     this.onEventIfInRange(
         new chrome.automation.AutomationEvent(
-            EventType.checkedStateChanged, evt.target));
+            EventType.checkedStateChanged, evt.target, evt.eventFrom));
   },
 
   /**
@@ -245,8 +257,8 @@ DesktopAutomationHandler.prototype = {
     if (node.root.role == RoleType.desktop)
       Output.flushNextSpeechUtterance();
 
-    this.onEventDefault(
-        new chrome.automation.AutomationEvent(EventType.focus, node));
+    this.onEventDefault(new chrome.automation.AutomationEvent(
+        EventType.focus, node, evt.eventFrom));
   },
 
   /**