Camera muting via sensor test pattern

Currently enabled/disabled via
  adb shell cmd media.camera set-camera-mute <1/0>

TODO:
- Connect to the wider sensor muting feature

This is suitable for testing apps to see how they react, and how Pixel phones
implement test patterns.

Test: GoogleCameraApp and AOSP Camera2 on sunfish appear to act as if they were in a dark room,
      no crashes, after calling 'adb shell cmd media.camera set-camera-mute 1'
Bug: 170156750
Change-Id: I85e1d2d6ee7d9bf1aee99c4bc8d5f98d36754228
diff --git a/services/camera/libcameraservice/api1/Camera2Client.h b/services/camera/libcameraservice/api1/Camera2Client.h
index f8da0b6..4d667e3 100644
--- a/services/camera/libcameraservice/api1/Camera2Client.h
+++ b/services/camera/libcameraservice/api1/Camera2Client.h
@@ -87,6 +87,9 @@
     virtual int32_t         getGlobalAudioRestriction();
     virtual status_t        setRotateAndCropOverride(uint8_t rotateAndCrop);
 
+    virtual bool            supportsCameraMute();
+    virtual status_t        setCameraMute(bool enabled);
+
     /**
      * Interface used by CameraService
      */