add voice interaction shortcut.

components/arc/common/voice_interaction.mojom

+// 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.
+//
+// Next MinVersion: 1
+
+module arc.mojom;
+
+struct VoiceInteractionStructure {
+  bool success;

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

You need to document all these fields.

[Muyuan, 2017/03/09 00:41:04]

Done.

+  int32 x;
+  int32 y;
+  int32 width;
+  int32 height;
+  float text_size;
+  array<uint8> text;
+  int32 color;
+  int32 bgcolor;
+  bool bold;
+  bool italic;
+  bool underline;
+  bool line_through;
+  bool has_selection;
+  int32 start_selection;
+  int32 end_selection;
+  string class_name;
+  array<VoiceInteractionStructure> children;
+};
+
+// Handles voice interaction queries from Android.
+// Next method ID: 2
+interface VoiceInteractionHost {
+  CaptureFocusedWindow@0() => (array<uint8> png_data);
+  GetVoiceInteractionStructure@1() => (VoiceInteractionStructure structure);
+};
+
+// Connects with Android system server.
+// Next method ID:2
+interface VoiceInteractionCaptureInstance {
+  Init@0(VoiceInteractionHost host_ptr);
+  StartVoiceInteractionSession@1();

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

Can this fail?

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

I plan to handle it in Android side and prints an error
msg. But given that it's a feature guarded by USE flag,
it shouldn't happen..

+};
+
+// Connects with ArcHome.
+// Next method ID: 1
+interface VoiceInteractionArcHomeInstance {
+  Init@0(VoiceInteractionHost host_ptr);
+};
+
+