register voice interaction preference.

components/arc/common/voice_interaction_framework.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: 7
+// Next MinVersion: 8
 
 module arc.mojom;
 
 import "screen_rect.mojom";
 
 // Handles voice interaction queries from Android.
 // Next method ID: 5
 interface VoiceInteractionFrameworkHost {
   // Returns a screenshot of currently focused window or empty array if
   // no window is focused. |data| represents the image encoded in JPEG
   // format.
   CaptureFocusedWindow@0() => (array<uint8> data);
 
   // Returns a fullscreen screenshot of the primary display.
   // |data| represents the image encoded in JPEG format.
   [MinVersion=1]CaptureFullscreen@1() => (array<uint8> data);
 
   // Notifies the host that the metalayer has closed or could not open.
   [MinVersion=2]OnMetalayerClosed@2();
 
   // Enables/disables screenshot taking.
   [MinVersion=3]SetMetalayerEnabled@3(bool enabled);
 
   // Notifies Chrome whether voice interaction session is running.
   [MinVersion=6]SetVoiceInteractionRunning@4(bool running);
 };
 
 // Connects with Android system server.
-// Next method ID: 7
+// Next method ID: 8
 interface VoiceInteractionFrameworkInstance {
   Init@0(VoiceInteractionFrameworkHost host_ptr);
 
   // Starts the voice interaction session in container.
   StartVoiceInteractionSession@1();
 
   // Starts the voice interaction session in container, with a screen region
   // selected.
   [MinVersion=1] StartVoiceInteractionSessionForRegion@2(ScreenRect region);
 
   // Shows/hides the metalayer in the container.
   [MinVersion=1] SetMetalayerVisibility@3([MinVersion=2] bool visible);
 
   // Turns on / off voice interaction in container.
   [MinVersion=4] SetVoiceInteractionEnabled@4(bool enable);
 
   // Turns on / off context for voice interaction in container. This function
   // controls whether screenshot and view hierarchy information should be sent
   // to container.
   [MinVersion=4] SetVoiceInteractionContextEnabled@5(bool enable);
 
   // Starts the voice interaction setup wizard in container.
   [MinVersion=5] StartVoiceInteractionSetupWizard@6();
-};
+
+  // Queries voice interaction settings status.
+  [MinVersion=7] GetVoiceInteractionSettings@7() 
+    => (bool defined, bool voice_interaction, bool context);

[dcheng, 2017/07/06 23:30:34]

1) Please explain what |defined|, |voice_interaction|, and |context| mean in
comments.

2) How would you feel about using a simple mojo struct to return these values?
Seeing three bools at the call site is pretty opaque (and it'd be easy to mix up
parameters by accident)

[Muyuan, 2017/07/07 19:02:56]

Done.

+};