Ensure the splash screen launched from system ui must be solid color.

Core may lose the launch source when launch with pending intent.

Bug: 215262680
Bug: 204414989
Test: verify always shows solid color splash screen when lauch activity
from system ui.

Change-Id: I187574ecaeadc73d856256cfeebe214c8b76e841

packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java

@@ -110,6 +110,7 @@ import android.view.WindowManager;
 import android.view.WindowManagerGlobal;
 import android.view.accessibility.AccessibilityManager;
 import android.widget.DateTimeView;
+import android.window.SplashScreen;
 
 import androidx.annotation.NonNull;
 import androidx.lifecycle.Lifecycle;
@@ -4096,6 +4097,7 @@ public class CentralSurfaces extends CoreStartable implements
         } else {
             options = ActivityOptions.makeBasic();
         }
+        options.setSplashScreenStyle(SplashScreen.SPLASH_SCREEN_STYLE_SOLID_COLOR);
         return options;
     }