Bring back Android Dreams.

Bug: 5121105
Change-Id: I29ddee7e4a83a01844cdb735de14c02dcbf3086c

res/xml/display_settings.xml

@@ -40,12 +40,10 @@
                 android:entries="@array/screen_timeout_entries"
                 android:entryValues="@array/screen_timeout_values" />
 
-        <!-- 
         <PreferenceScreen 
                 android:title="@string/dream_settings_title" 
                 android:summary="@string/dream_settings_summary"
                 android:fragment="com.android.settings.DreamSettings" />
-        -->
 
         <ListPreference
                 android:key="font_size"

src/com/android/settings/DreamTesterPreference.java

@@ -67,7 +67,7 @@ public class DreamTesterPreference extends Preference {
                 .setComponent(cn)
                 .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                     | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
-                    | Intent.FLAG_ACTIVITY_SINGLE_TOP)
+                    )
                 .putExtra("android.dreams.TEST", true);
             getContext().startActivity(intent);
         }