Select-to-speak event handler

chrome/browser/ui/aura/accessibility/automation_manager_aura.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 50 matching lines @@
   // Reset the serializer to save memory.
   current_tree_serializer_->Reset();
 }
 
 void AutomationManagerAura::HandleEvent(BrowserContext* context,
                                         views::View* view,
                                         ui::AXEvent event_type) {
   if (!enabled_)
     return;
 
-  views::AXAuraObjWrapper* aura_obj =
-      views::AXAuraObjCache::GetInstance()->GetOrCreate(view);
+  views::AXAuraObjWrapper* aura_obj = view ?
+      views::AXAuraObjCache::GetInstance()->GetOrCreate(view) :
+      current_tree_->GetRoot();
   SendEvent(nullptr, aura_obj, event_type);
 }
 
 void AutomationManagerAura::HandleAlert(content::BrowserContext* context,
                                         const std::string& text) {
   if (!enabled_)
     return;
 
   views::AXAuraObjWrapper* obj =
       static_cast<AXRootObjWrapper*>(current_tree_->GetRoot())
@@ skipping 111 matching lines @@
 
   processing_events_ = false;
   auto pending_events_copy = pending_events_;
   pending_events_.clear();
   for (size_t i = 0; i < pending_events_copy.size(); ++i) {
     SendEvent(context,
               pending_events_copy[i].first,
               pending_events_copy[i].second);
   }
 }