Refactor and send voice interaction structure

chrome/browser/chromeos/arc/voice_interaction/arc_voice_interaction_arc_home_service.h

Index: chrome/browser/chromeos/arc/voice_interaction/arc_voice_interaction_arc_home_service.h
diff --git a/chrome/browser/chromeos/arc/voice_interaction/arc_voice_interaction_arc_home_service.h b/chrome/browser/chromeos/arc/voice_interaction/arc_voice_interaction_arc_home_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..24de22223a63f265dd941513382623f85d266a2b
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+++ b/chrome/browser/chromeos/arc/voice_interaction/arc_voice_interaction_arc_home_service.h
@@ -0,0 +1,49 @@
+// 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_VOICE_INTERACTION_ARC_VOICE_INTERACTION_ARC_HOME_SERVICE_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_VOICE_INTERACTION_ARC_VOICE_INTERACTION_ARC_HOME_SERVICE_H_
+
+#include "base/macros.h"
+#include "components/arc/arc_service.h"
+#include "components/arc/common/voice_interaction_arc_home.mojom.h"
+#include "components/arc/instance_holder.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "ui/accessibility/ax_tree_update.h"
+
+namespace ui {
+struct AXSnapshotNodeAndroid;
+}  // ui
+
+namespace arc {
+
+// ArcVoiceInteractionArcHomeService provides view hierarchy to to ARC to be
+// used by VoiceInteractionSession. This class lives on the UI thread.
+class ArcVoiceInteractionArcHomeService
+    : public ArcService,
+      public mojom::VoiceInteractionArcHomeHost,
+      public InstanceHolder<mojom::VoiceInteractionArcHomeInstance>::Observer {
+ public:
+  explicit ArcVoiceInteractionArcHomeService(ArcBridgeService* bridge_service);
+  ~ArcVoiceInteractionArcHomeService() override;
+
+  // InstanceHolder<mojom::VoiceInteractionArcHomeInstance> overrides;
+  void OnInstanceReady() override;
+
+  // Gets view hierarchy from current focused app and send it to ARC.
+  void GetVoiceInteractionStructure(
+      const GetVoiceInteractionStructureCallback& callback) override;
+
+  static mojom::VoiceInteractionStructurePtr
+  CreateVoiceInteractionStructureForTesting(
+      const ui::AXSnapshotNodeAndroid& view_structure);
+
+ private:
+  mojo::Binding<mojom::VoiceInteractionArcHomeHost> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcVoiceInteractionArcHomeService);
+};
+
+}  // namespace arc
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_VOICE_INTERACTION_ARC_VOICE_INTERACTION_ARC_HOME_SERVICE_H_