docs: add giagram about native GUI entities.

atsushieno · May 9, 2024 · 721542f · 721542f
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diff --git a/docs/design/GUI.md b/docs/design/GUI.md
@@ -156,6 +156,8 @@ Unlike Web UI protocol, we don't need DSP controllers as it is basically a matte
 
 ### SurfaceControlViewHost: controller from Kotlin API
 
+![Native UI boundary](../images/native-ui.drawio.svg)
+
 The host will instantiate the plugin's View by sending an independent Message to an independent GUI controller (i.e. not `AudioPluginService`, not in the .aidl). It is due to current limitation on AIDL that cannot handle Message/Parcelables in .aidl that are being used in both Java and NDK.
 
 It is done in Kotlin land, as it requires couple of Java/Kotlin classes e.g. `Service`, `SurfaceView` and `SurfaceControlViewHost.SurfacePackage` instances. Here is these internal steps to use it:

diff --git a/docs/images/native-ui.drawio.svg b/docs/images/native-ui.drawio.svg