Assign default icon to users at creation time and in SystemUI.

Right now different code in System UI, Settings app and other places replace the
user icon with their own default. This tries to make it consistent by moving the
mechanism used in Settings in a helper class.

Bug: 17311038
Change-Id: Ic858c65bf82a98b9806dbba029e7cdcf441f372e
diff --git a/core/java/android/app/ApplicationPackageManager.java b/core/java/android/app/ApplicationPackageManager.java
index d746745..68606836 100644
--- a/core/java/android/app/ApplicationPackageManager.java
+++ b/core/java/android/app/ApplicationPackageManager.java
@@ -66,6 +66,7 @@
 
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.util.Preconditions;
+import com.android.internal.util.UserIcons;
 
 import dalvik.system.VMRuntime;
 
@@ -1660,7 +1661,11 @@
      */
     public Drawable loadItemIcon(PackageItemInfo itemInfo, ApplicationInfo appInfo) {
         if (itemInfo.showUserIcon != UserHandle.USER_NULL) {
-            return new BitmapDrawable(getUserManager().getUserIcon(itemInfo.showUserIcon));
+            Bitmap bitmap = getUserManager().getUserIcon(itemInfo.showUserIcon);
+            if (bitmap == null) {
+                return UserIcons.getDefaultUserIcon(itemInfo.showUserIcon, /* light= */ false);
+            }
+            return new BitmapDrawable(bitmap);
         }
         Drawable dr = null;
         if (itemInfo.packageName != null) {