Simplifying InstallShortcutReceiver

> Removing support for legacy shortcuts (with embedded icon)
> Unifying pattern for storing the data in prefs

Change-Id: Ife250807c7ce5337969d25444ee23c751bc2a487
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 068d0bc..dea2a8d 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -25,6 +25,7 @@
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.LauncherActivityInfo;
 import android.content.pm.LauncherApps;
@@ -639,6 +640,14 @@
         }
     }
 
+    /**
+     * @return true is the extra is either null or is of type {@param type}
+     */
+    public static boolean isValidExtraType(Intent intent, String key, Class type) {
+        Object extra = intent.getParcelableExtra(key);
+        return extra == null || type.isInstance(extra);
+    }
+
     public static float squaredHypot(float x, float y) {
         return x * x + y * y;
     }