Announce private profile screenshot saving.

Extract announcement logic behind a flag (not much to extract, but it's
one less thing in the controller and now can be tested).

Test: atest com.android.systemui.screenshot
Flag: com.android.systemui.screenshot_private_profile_accessibility_announcement
Bug: 326941376
Change-Id: Iec464e4487e14a5a44298521e18d5b895eb27e90
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index f3e2272..f937c09 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -523,6 +523,16 @@
 }
 
 flag {
+    name: "screenshot_private_profile_accessibility_announcement_fix"
+    namespace: "systemui"
+    description: "Modified a11y announcement for private space screenshots"
+    bug: "326941376"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}
+
+flag {
     name: "screenshot_private_profile_behavior_fix"
     namespace: "systemui"
     description: "Private profile support for screenshots"