add voice interaction shortcut.

chrome/browser/chromeos/arc/arc_voice_interaction_service.h

Index: chrome/browser/chromeos/arc/arc_voice_interaction_service.h
diff --git a/chrome/browser/chromeos/arc/arc_voice_interaction_service.h b/chrome/browser/chromeos/arc/arc_voice_interaction_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..c7bf18a5c8e09c542a1944bb2a33f93ce4d1c221
--- /dev/null
+++ b/chrome/browser/chromeos/arc/arc_voice_interaction_service.h
@@ -0,0 +1,81 @@
+// 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"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "ui/base/accelerators/accelerator.h"
+
+namespace arc {
+
+class ArcVoiceInteractionService;
+
+class ArcHomeObserver

[Luis Héctor Chávez, 2017/03/08 15:22:40]

This can be forward-declared in the private section of
ArcVoiceInteractionService, and declared in the .cc file:

class ArcVoiceInteractionService : ... {
 ...
 private:
  class ArcHomeObserver;
  class CaptureObserver;
  
  std::unique_ptr<ArcHomeObserver> home_observer_;
  std::unique_ptr<CaptureObserver> capture_observer_;
};

[Muyuan, 2017/03/09 00:41:03]

Done.

+    : public InstanceHolder<mojom::VoiceInteractionArcHomeInstance>::Observer {
+  ArcVoiceInteractionService* service_;
+
+ public:

[Luis Héctor Chávez, 2017/03/08 15:22:40]

in Chromium/Google, the order is public, protected, private. source:
https://google.github.io/styleguide/cppguide.html#Declaration_Order

[Muyuan, 2017/03/09 00:41:03]

Done.

+  explicit ArcHomeObserver(ArcVoiceInteractionService* service)
+      : service_(service) {}
+  void OnInstanceReady() override;
+  void OnInstanceClosed() override;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcHomeObserver);
+};
+
+class CaptureObserver
+    : public InstanceHolder<mojom::VoiceInteractionCaptureInstance>::Observer {
+  ArcVoiceInteractionService* service_;
+
+ public:
+  explicit CaptureObserver(ArcVoiceInteractionService* service)
+      : service_(service) {}
+  void OnInstanceReady() override;
+  void OnInstanceClosed() override;
+
+  DISALLOW_COPY_AND_ASSIGN(CaptureObserver);
+};
+
+// Lives on the UI thread.
+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:
+  std::unique_ptr<ArcHomeObserver> home_observer_;
+  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_