add voice interaction shortcut.

chrome/browser/chromeos/arc/arc_voice_interaction_service.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_ARC_VOICE_INTERACTION_SERVICE_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_VOICE_INTERACTION_SERVICE_H_
+
+#include "base/macros.h"
+#include "components/arc/arc_service.h"
+#include "components/arc/common/voice_interaction.mojom.h"
+#include "components/arc/instance_holder.h"

[hidehiko, 2017/03/10 06:14:50]

nit: Looks unused. Move to .cc?

[Muyuan, 2017/03/10 22:36:10]

Done.

+#include "mojo/public/cpp/bindings/binding.h"
+#include "ui/base/accelerators/accelerator.h"
+
+namespace arc {
+
+// Lives on the UI thread.

[hidehiko, 2017/03/10 06:14:49]

Could you document what is the responsibility of this class?

[Muyuan, 2017/03/10 22:36:10]

Done.

+class ArcVoiceInteractionService : public ArcService,
+                                   public mojom::VoiceInteractionHost,
+                                   public ui::AcceleratorTarget {
+ public:
+  explicit ArcVoiceInteractionService(ArcBridgeService* bridge_service);
+  ~ArcVoiceInteractionService() override;
+
+  void OnCaptureInstanceReady();
+  void OnCaptureInstanceClosed();
+
+  void OnArcHomeInstanceReady();
+  void OnArcHomeInstanceClosed();
+
+  // ui::AcceleratorTarget overrides.
+  bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
+  bool CanHandleAccelerators() const override;
+
+  // mojom::VoiceInteractionHost overrides.
+  void GetVoiceInteractionStructure(
+      const GetVoiceInteractionStructureCallback& callback) override;
+  void CaptureFocusedWindow(
+      const CaptureFocusedWindowCallback& callback) override;
+
+ private:
+  class ArcHomeObserver;
+  class CaptureObserver;
+
+  std::unique_ptr<ArcHomeObserver> home_observer_;

[hidehiko, 2017/03/10 06:14:50]

nit: Please
#include <memory>

[Muyuan, 2017/03/10 22:36:10]

Done.

+  std::unique_ptr<CaptureObserver> capture_observer_;
+
+  mojo::Binding<mojom::VoiceInteractionHost> home_binding_;
+  mojo::Binding<mojom::VoiceInteractionHost> capture_binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcVoiceInteractionService);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_VOICE_INTERACTION_SERVICE_H_