Complete live region support in ChromeVox Next.

chrome/renderer/extensions/automation_internal_custom_bindings.cc

Index: chrome/renderer/extensions/automation_internal_custom_bindings.cc
diff --git a/chrome/renderer/extensions/automation_internal_custom_bindings.cc b/chrome/renderer/extensions/automation_internal_custom_bindings.cc
index e68edce85d3ff451f7ef206e19c291edfaf64043..11d3fcdb92c8ac0a3f37aba6fd2b842d148b1809 100644
--- a/chrome/renderer/extensions/automation_internal_custom_bindings.cc
+++ b/chrome/renderer/extensions/automation_internal_custom_bindings.cc
@@ -393,7 +393,10 @@ private:
 
 AutomationInternalCustomBindings::AutomationInternalCustomBindings(
     ScriptContext* context)
-    : ObjectBackedNativeHandler(context), is_active_profile_(true) {
+    : ObjectBackedNativeHandler(context),
+      is_active_profile_(true),
+      tree_change_observer_mask_(
+          api::automation::TREE_CHANGE_OBSERVER_MASK_NOTREECHANGES) {
   // It's safe to use base::Unretained(this) here because these bindings
   // will only be called on a valid AutomationInternalCustomBindings instance
   // and none of the functions have any side effects.
@@ -406,6 +409,7 @@ AutomationInternalCustomBindings::AutomationInternalCustomBindings(
   ROUTE_FUNCTION(GetRoutingID);
   ROUTE_FUNCTION(StartCachingAccessibilityTrees);
   ROUTE_FUNCTION(DestroyAccessibilityTree);
+  ROUTE_FUNCTION(SetTreeChangeObserverMask);
   ROUTE_FUNCTION(GetChildIDAtIndex);
   #undef ROUTE_FUNCTION
 
@@ -732,6 +736,18 @@ void AutomationInternalCustomBindings::DestroyAccessibilityTree(
   delete cache;
 }
 
+void AutomationInternalCustomBindings::SetTreeChangeObserverMask(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 1 || !args[0]->IsString()) {
+    ThrowInvalidArgumentsException(this);
+    return;
+  }
+
+  std::string mask_str = *v8::String::Utf8Value(args[0]);
+  tree_change_observer_mask_ =
+      api::automation::ParseTreeChangeObserverMask(mask_str);
+}
+
 void AutomationInternalCustomBindings::RouteTreeIDFunction(
     const std::string& name,
     TreeIDFunction callback) {
@@ -909,6 +925,24 @@ void AutomationInternalCustomBindings::SendTreeChangeEvent(
   if (!is_active_profile_)
     return;
 
+  if (node->data().role != ui::AX_ROLE_EMBEDDED_OBJECT &&
+      node->data().role != ui::AX_ROLE_WEB_VIEW) {
+    switch (tree_change_observer_mask_) {
+      case api::automation::TREE_CHANGE_OBSERVER_MASK_NOTREECHANGES:
+      default:
+        return;
+      case api::automation::TREE_CHANGE_OBSERVER_MASK_LIVEREGIONTREECHANGES:
+        if (!node->data().HasStringAttribute(
+                ui::AX_ATTR_CONTAINER_LIVE_STATUS) &&
+            node->data().role != ui::AX_ROLE_ALERT) {
+          return;
+        }
+        break;
+      case api::automation::TREE_CHANGE_OBSERVER_MASK_ALLTREECHANGES:
+        break;
+    }
+  }
+
   auto iter = axtree_to_tree_cache_map_.find(tree);
   if (iter == axtree_to_tree_cache_map_.end())
     return;