Migrate WM_ENABLE_PREDICTIVE_BACK_QS_DIALOG_ANIM flag to aconfig

Bug: 309545085
Flag: ACONFIG com.android.systemui.predictive_back_qs_dialog_anim DISABLED
Test: atest SystemUIDialogTest
Test: atest FontScalingDialogDelegateTest
Test: atest BroadcastDialogDelegateTest
Test: Manual, i.e. testing build on device and verifying behaviour of flagged feature
Change-Id: I94311d67f79fd18897bcf70afaae7067a9e227ad
diff --git a/packages/SystemUI/aconfig/predictive_back.aconfig b/packages/SystemUI/aconfig/predictive_back.aconfig
index 1ad1666..d0e6b28 100644
--- a/packages/SystemUI/aconfig/predictive_back.aconfig
+++ b/packages/SystemUI/aconfig/predictive_back.aconfig
@@ -19,4 +19,11 @@
     namespace: "systemui"
     description: "Enable Predictive Back Animation in Bouncer"
     bug: "309545085"
+}
+
+flag {
+    name: "predictive_back_animate_dialogs"
+    namespace: "systemui"
+    description: "Enable Predictive Back Animation for SysUI dialogs"
+    bug: "309545085"
 }
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