Set mContext scope to protected.

Bug: 29582254
Change-Id: I5c9861373b712a4bd9e5f1fba1e638d1ff6be170
diff --git a/packages/SystemUI/src/com/android/systemui/assist/AssistManager.java b/packages/SystemUI/src/com/android/systemui/assist/AssistManager.java
index af2a286..9eceeac 100644
--- a/packages/SystemUI/src/com/android/systemui/assist/AssistManager.java
+++ b/packages/SystemUI/src/com/android/systemui/assist/AssistManager.java
@@ -47,7 +47,7 @@
     private static final long TIMEOUT_SERVICE = 2500;
     private static final long TIMEOUT_ACTIVITY = 1000;
 
-    private final Context mContext;
+    protected final Context mContext;
     private final WindowManager mWindowManager;
     private final AssistDisclosure mAssistDisclosure;