Suppress accessibility events when user is navigating away.

content/browser/accessibility/browser_accessibility_manager.cc

Index: content/browser/accessibility/browser_accessibility_manager.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager.cc b/content/browser/accessibility/browser_accessibility_manager.cc
index 6049901b5e3257dd8489209e79e7da9f4e2da3a6..34a82257c4d120df620b8e1a00b49630dd5038de 100644
--- a/content/browser/accessibility/browser_accessibility_manager.cc
+++ b/content/browser/accessibility/browser_accessibility_manager.cc
@@ -79,6 +79,7 @@ BrowserAccessibilityManager::BrowserAccessibilityManager(
       factory_(factory),
       tree_(new ui::AXSerializableTree()),
       focus_(NULL),
+      user_is_navigating_away_(false),
       osk_state_(OSK_ALLOWED) {
   tree_->SetDelegate(this);
 }
@@ -91,6 +92,7 @@ BrowserAccessibilityManager::BrowserAccessibilityManager(
       factory_(factory),
       tree_(new ui::AXSerializableTree()),
       focus_(NULL),
+      user_is_navigating_away_(false),
       osk_state_(OSK_ALLOWED) {
   tree_->SetDelegate(this);
   Initialize(initial_tree);
@@ -152,6 +154,22 @@ void BrowserAccessibilityManager::OnWindowBlurred() {
     NotifyAccessibilityEvent(ui::AX_EVENT_BLUR, GetFromAXNode(focus_));
 }
 
+void BrowserAccessibilityManager::UserIsNavigatingAway() {
+  user_is_navigating_away_ = true;
+}
+
+void BrowserAccessibilityManager::UserIsReloading() {
+  user_is_navigating_away_ = true;
+}
+
+void BrowserAccessibilityManager::NavigationSucceeded() {
+  user_is_navigating_away_ = false;
+}
+
+void BrowserAccessibilityManager::NavigationFailed() {
+  user_is_navigating_away_ = false;
+}
+
 void BrowserAccessibilityManager::GotMouseDown() {
   osk_state_ = OSK_ALLOWED_WITHIN_FOCUSED_OBJECT;
   NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, GetFromAXNode(focus_));