ResolverActivity: use hardware rendering for Intent Resolver dialog

Workaround to avoid graphic glitches with gbm_gralloc happening
when launcher needs to be selected at first boot

Suggested by Franco Catrin for issues affecting software rendering path:
android-rpi/device_brcm_rpi3#49

core/java/com/android/internal/app/ResolverActivity.java

@@ -57,6 +57,7 @@
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.widget.AbsListView;
 import android.widget.AdapterView;
 import android.widget.BaseAdapter;
@@ -252,6 +253,10 @@ protected void onCreate(Bundle savedInstanceState, Intent intent,
     protected void onCreate(Bundle savedInstanceState, Intent intent,
             CharSequence title, int defaultTitleRes, Intent[] initialIntents,
             List<ResolveInfo> rList, boolean supportsAlwaysUseOption) {
+
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
+            WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
+
         setTheme(R.style.Theme_DeviceDefault_Resolver);
         super.onCreate(savedInstanceState);