Prompting the user to set Pixel/Quickstep as default Home app.

requestQuietMode API throws SecurityException in case its called
from a non-default Launcher app.
To mitigate this, we catch the exception and prompt the user
to set their default launcher to the current app.

Video(Pixel): https://photos.app.goo.gl/ni5X1c6vBbYW2JMJ9
Video(Pixel-aosp): https://photos.app.goo.gl/cYLJpTYW76Jnbonc9

Bug: 320446272
Test: Manual
Flag: NONE Bug fix tweak.
Change-Id: I6afb2ae85cabc038e1503e9c34eebd974c4f7a50

src/com/android/launcher3/allapps/PrivateProfileManager.java

@@ -281,10 +281,28 @@ public class PrivateProfileManager extends UserProfileManager {
 
     @Override
     public void setQuietMode(boolean enable) {
-        super.setQuietMode(enable);
+        UI_HELPER_EXECUTOR.post(() ->
+                mUserCache.getUserProfiles()
+                        .stream()
+                        .filter(getUserMatcher())
+                        .findFirst()
+                        .ifPresent(userHandle -> setQuietModeSafely(enable, userHandle)));
         mReadyToAnimate = true;
     }
 
+    /**
+     * Sets Quiet Mode for Private Profile.
+     * If {@link SecurityException} is thrown, prompts the user to set this launcher as HOME app.
+     */
+    private void setQuietModeSafely(boolean enable, UserHandle userHandle) {
+        try {
+            mUserManager.requestQuietModeEnabled(enable, userHandle);
+        } catch (SecurityException ex) {
+            ApiWrapper.INSTANCE.get(mAllApps.mActivityContext)
+                    .assignDefaultHomeRole(mAllApps.mActivityContext);
+        }
+    }
+
     /**
      * Expand the private space after the app list has been added and updated from
      * {@link AlphabeticalAppsList#onAppsUpdated()}