Fire accessibility focus/blur events on root web document.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 84936607b01433d82c25f3d7e8ff39f4c47686c4..3a758a93131c25978c38f93bdd783175d92851bb 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -3116,6 +3116,10 @@ void RenderWidgetHostViewAura::OnWindowFocused(aura::Window* gained_focus,
     } else {
       host_->SetInputMethodActive(false);
     }
+
+    BrowserAccessibilityManager* manager = GetBrowserAccessibilityManager();
+    if (manager)
+      manager->OnWindowFocused();
   } else if (window_ == lost_focus) {
     host_->SetActive(false);
     host_->Blur();
@@ -3149,6 +3153,10 @@ void RenderWidgetHostViewAura::OnWindowFocused(aura::Window* gained_focus,
       in_shutdown_ = true;
       host_->Shutdown();
     }
+
+    BrowserAccessibilityManager* manager = GetBrowserAccessibilityManager();
+    if (manager)
+      manager->OnWindowBlurred();
   }
 }