Merge "Add System Back function to SystemUiProxy" into sc-dev am: a090cfc836

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14040067

Change-Id: I8466fe6457470e4bb79895fe6d4053994e030d5d
diff --git a/quickstep/src/com/android/quickstep/SystemUiProxy.java b/quickstep/src/com/android/quickstep/SystemUiProxy.java
index cf71eae..1f332c4 100644
--- a/quickstep/src/com/android/quickstep/SystemUiProxy.java
+++ b/quickstep/src/com/android/quickstep/SystemUiProxy.java
@@ -88,6 +88,17 @@
     }
 
     @Override
+    public void onBackPressed() {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.onBackPressed();
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call onBackPressed", e);
+            }
+        }
+    }
+
+    @Override
     public IBinder asBinder() {
         // Do nothing
         return null;