Set keys to traverse accessibility tree. Using focus ring to highlight selected node.

chrome/browser/chromeos/accessibility/spoken_feedback_event_rewriter.cc

 // Copyright 2015 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/chromeos/accessibility/spoken_feedback_event_rewriter.h"
 
 #include <string>
 #include <utility>
 
 #include "ash/shell.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
-#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/chromeos/accessibility/event_handler_common.h"
 #include "chrome/common/extensions/extension_constants.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_host.h"
-#include "extensions/browser/extension_registry.h"
-#include "extensions/browser/process_manager.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/content_accelerators/accelerator_util.h"
 #include "ui/events/event.h"
 #include "ui/events/event_processor.h"
 
 SpokenFeedbackEventRewriterDelegate::SpokenFeedbackEventRewriterDelegate() {}
 
 bool SpokenFeedbackEventRewriterDelegate::IsSpokenFeedbackEnabled() const {
   return chromeos::AccessibilityManager::Get()->IsSpokenFeedbackEnabled();
 }
 
 bool SpokenFeedbackEventRewriterDelegate::DispatchKeyEventToChromeVox(
     const ui::KeyEvent& key_event,
     bool capture) {
-  if (!chromeos::AccessibilityManager::Get())
-    return false;
-
-  content::BrowserContext* context = ProfileManager::GetActiveUserProfile();
-  if (!context)
-    return false;
-
-  const extensions::Extension* extension =
-      extensions::ExtensionRegistry::Get(context)->enabled_extensions().GetByID(
-          extension_misc::kChromeVoxExtensionId);
-  if (!extension)
-    return false;
-
-  extensions::ExtensionHost* host =
-      extensions::ProcessManager::Get(context)
-          ->GetBackgroundHostForExtension(extension->id());
-  if (!host)
-    return false;
-
-  content::RenderViewHost* rvh = host->render_view_host();
 
   // Always capture the Search key.
   capture |= key_event.IsCommandDown();
 
   // Don't capture tab as it gets consumed by Blink so never comes back
   // unhandled. In third_party/WebKit/Source/core/input/EventHandler.cpp, a
   // default tab handler consumes tab even when no focusable nodes are found; it
   // sets focus to Chrome and eats the event.
   if (key_event.GetDomKey() == ui::DomKey::TAB)
     capture = false;
 
+  extensions::ExtensionHost* host = chromeos::GetAccessibilityExtensionHost(
+      extension_misc::kChromeVoxExtensionId);
+  if (!host)
+    return false;
+
   // Listen for any unhandled keyboard events from ChromeVox's background page
   // when capturing keys to reinject.
   if (capture)
     host->host_contents()->SetDelegate(this);
   else
     host->host_contents()->SetDelegate(nullptr);
 
   // Forward all key events to ChromeVox's background page.
-  const content::NativeWebKeyboardEvent web_event(key_event);
-  rvh->GetWidget()->ForwardKeyboardEvent(web_event);
+  chromeos::ForwardKeyToExtension(key_event, host);
 
   if ((key_event.key_code() >= ui::VKEY_F1) &&
       (key_event.key_code() <= ui::VKEY_F12))
     return false;
 
   return capture;
 }
 
 void SpokenFeedbackEventRewriterDelegate::HandleKeyboardEvent(
     content::WebContents* source,
@@ skipping 46 matching lines @@
   if (delegate_->DispatchKeyEventToChromeVox(key_event, capture))
     return ui::EVENT_REWRITE_DISCARD;
   return ui::EVENT_REWRITE_CONTINUE;
 }
 
 ui::EventRewriteStatus SpokenFeedbackEventRewriter::NextDispatchEvent(
     const ui::Event& last_event,
     std::unique_ptr<ui::Event>* new_event) {
   return ui::EVENT_REWRITE_CONTINUE;
 }