Grant READ_DREAM_STATE & WRITE_DREAM_STATE permissions to shell

This is required for ambient display tests

Bug: 147874708
Test: Run newly added ambient display tests.
Merged-In: I61c28e15c4e5c3d0ffee4137ecb86e33f7e8f64d
Change-Id: I26ab1cd48816ddb3aa8b30708726a3e1a3a20b9a
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index 14c7795..5a5a757 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -220,6 +220,10 @@
     <!-- Permission required for CTS test - TetheringManagerTest -->
     <uses-permission android:name="android.permission.TETHER_PRIVILEGED"/>
 
+    <!-- Permissions required to test ambient display. -->
+    <uses-permission android:name="android.permission.READ_DREAM_STATE"/>
+    <uses-permission android:name="android.permission.WRITE_DREAM_STATE"/>
+
     <application android:label="@string/app_label"
                 android:theme="@android:style/Theme.DeviceDefault.DayNight"
                 android:defaultToDeviceProtectedStorage="true"