Initial support for native accessibility in ARC

chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_ACCESSIBILITY_ARC_ACCESSIBILITY_HELPER_BRIDGE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ACCESSIBILITY_ARC_ACCESSIBILITY_HELPER_BRIDGE_H_
 
 #include "components/arc/arc_service.h"
 #include "components/arc/common/accessibility_helper.mojom.h"
 #include "components/arc/instance_holder.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace arc {
 
 class ArcBridgeService;
+class AXTreeSourceArc;
 
 // ArcAccessibilityHelperBridge is an instance to receive converted Android
 // accessibility events and info via mojo interface and dispatch them to chrome
 // os components.
 class ArcAccessibilityHelperBridge
     : public ArcService,
       public mojom::AccessibilityHelperHost,
       public InstanceHolder<mojom::AccessibilityHelperInstance>::Observer {
  public:
   explicit ArcAccessibilityHelperBridge(ArcBridgeService* bridge_service);
   ~ArcAccessibilityHelperBridge() override;
 
   // InstanceHolder<mojom::AccessibilityHelperInstance>::Observer overrides.
   void OnInstanceReady() override;
 
   // mojom::AccessibilityHelperHost overrides.
   void OnAccessibilityEvent(
-      mojom::AccessibilityEventType event_type,
-      mojom::AccessibilityNodeInfoDataPtr event_source) override;
+      mojom::AccessibilityEventDataPtr event_data) override;
 
  private:
   mojo::Binding<mojom::AccessibilityHelperHost> binding_;
 
+  std::unique_ptr<AXTreeSourceArc> tree_;
+
   DISALLOW_COPY_AND_ASSIGN(ArcAccessibilityHelperBridge);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ACCESSIBILITY_ARC_ACCESSIBILITY_HELPER_BRIDGE_H_