Fix issue #17752399: Multiple apps broken by GET_TASKS permission change

Keep around GET_TASKS as a permission available to apps, so apps still
think they have it and don't get all uppity because they don't.

Add a new REAL_GET_TASKS that is the actual permission now.

Plus some temporary compatibility code until everyone can transition
fromn GET_TASKS to REAL_GET_TASKS.

Change-Id: I12c1102eed24844685dcbd2fa3b612811603958f
diff --git a/tests/ActivityTests/AndroidManifest.xml b/tests/ActivityTests/AndroidManifest.xml
index f31f4f2..3930fd6 100644
--- a/tests/ActivityTests/AndroidManifest.xml
+++ b/tests/ActivityTests/AndroidManifest.xml
@@ -16,7 +16,7 @@
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.google.android.test.activity">
-    <uses-permission android:name="android.permission.GET_TASKS" />
+    <uses-permission android:name="android.permission.REAL_GET_TASKS" />
     <uses-permission android:name="android.permission.REORDER_TASKS" />
     <uses-permission android:name="android.permission.REMOVE_TASKS" />
     <uses-permission android:name="android.permission.READ_FRAME_BUFFER" />