app/internal/window: [Android] work around flickering on ChromeOS

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/window/GioView.java

@@ -12,6 +12,7 @@ import android.app.Fragment;
 import android.app.FragmentManager;
 import android.app.FragmentTransaction;
 import android.content.Context;
+import android.graphics.Color;
 import android.graphics.Rect;
 import android.os.Build;
 import android.text.Editable;
@@ -56,6 +57,10 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 		// Late initialization of the Go runtime to wait for a valid context.
 		Gio.init(context.getApplicationContext());
 
+		// Set background color to transparent to avoid a flickering
+		// issue on ChromeOS.
+		setBackgroundColor(Color.argb(0, 0, 0, 0));
+
 		ViewConfiguration conf = ViewConfiguration.get(context);
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 			scrollXScale = conf.getScaledHorizontalScrollFactor();