Show default app icon in default app screen.

- Renamed AdvancedAppSettings to DefaultAppSettings.
- Add logic to DefaultAppPreferenceController to also display icon.
- Modified DefautlAssistPrefController to suppress gear icon, and use
  the controller in default app setting UI to display icon.
- Remove dynamic injected payment setting activity and create the
  setting statically in xml.
- Add DefaultPaymentSettingsPreference to display default payment app
  title (no icon because we can't get it)

Change-Id: I6b8c768da0bafe5ec9a85ba9c79c7993b449be25
Fix: 36458534
Test: robotests

src/com/android/settings/applications/defaultapps/DefaultAppPreferenceController.java

@@ -18,6 +18,7 @@ package com.android.settings.applications.defaultapps;
 
 import android.content.Context;
 import android.content.Intent;
+import android.graphics.drawable.Drawable;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.support.v7.preference.Preference;
@@ -54,9 +55,11 @@ public abstract class DefaultAppPreferenceController extends AbstractPreferenceC
         CharSequence defaultAppLabel = getDefaultAppLabel();
         if (!TextUtils.isEmpty(defaultAppLabel)) {
             preference.setSummary(defaultAppLabel);
+            preference.setIcon(getDefaultAppIcon());
         } else {
             Log.d(TAG, "No default app");
             preference.setSummary(R.string.app_list_preference_none);
+            preference.setIcon(null);
         }
         mayUpdateGearIcon(app, preference);
     }
@@ -84,6 +87,17 @@ public abstract class DefaultAppPreferenceController extends AbstractPreferenceC
         return null;
     }
 
+    public Drawable getDefaultAppIcon() {
+        if (!isAvailable()) {
+            return null;
+        }
+        final DefaultAppInfo app = getDefaultAppInfo();
+        if (app != null) {
+            return app.loadIcon();
+        }
+        return null;
+    }
+
     public CharSequence getDefaultAppLabel() {
         if (!isAvailable()) {
             return null;