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 0bc4260ac629c53f97b73de99dfd7371a88ace76..4ef63cf5c3f168a4e8b5bfe7147a25221db3e47c 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 +154,18 @@ void BrowserAccessibilityManager::OnWindowBlurred() {
     NotifyAccessibilityEvent(ui::AX_EVENT_BLUR, GetFromAXNode(focus_));
 }
 
+void BrowserAccessibilityManager::UserIsNavigatingAway(bool is_reload) {

[nasko, 2015/02/03 17:28:05]

This is unused. Why add this parameter now?

[dmazzoni, 2015/02/03 17:40:54]

I added it here to let you know it's something I'd like to make use of in a
follow-up. I didn't add the code to make use of it because it'd just increase
the size of this CL, but I could add it in if you want.

+  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_));