Suppress accessibility events when user is navigating away.

When the user navigates to a new page, stop sending accessibility
events on the old page.

BUG=421116,450409

Committed: https://crrev.com/6ce40a1e561892849c1f6ac070dda140f6cc0115
Cr-Commit-Position: refs/heads/master@{#314812}

Review URL: https://codereview.chromium.org/830053004

Cr-Commit-Position: refs/heads/master@{#315231}

1 files changed, 18 insertions, 0 deletions

diff --git a/content/browser/accessibility/browser_accessibility_manager.cc b/content/browser/accessibility/browser_accessibility_manager.cc
index 6049901..34a8225 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_));