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..2c355da0ff18fac207c0ebc2ca3aacba152e03eb 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();
@@ -3126,6 +3130,10 @@ void RenderWidgetHostViewAura::OnWindowFocused(aura::Window* gained_focus,
     if (touch_editing_client_)
       touch_editing_client_->EndTouchEditing(false);
 
+    BrowserAccessibilityManager* manager = GetBrowserAccessibilityManager();
+    if (manager)
+      manager->OnWindowBlurred();
+
     // If we lose the focus while fullscreen, close the window; Pepper Flash
     // won't do it for us (unlike NPAPI Flash). However, we do not close the
     // window if we lose the focus to a window on another display.