CallManager: add getAllPhones().

Change-Id: I50589aaec55925d93c392f15a22c70d2a6634b87

telephony/java/com/android/internal/telephony/CallManager.java

@@ -24,6 +24,7 @@ import android.os.RegistrantList;
 import android.telephony.PhoneStateListener;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -162,6 +163,14 @@ public final class CallManager {
         return INSTANCE;
     }
 
+    /**
+     * Returns all the registered phone objects.
+     * @return all the registered phone objects.
+     */
+    public List<Phone> getAllPhones() {
+        return Collections.unmodifiableList(mPhones);
+    }
+
     /**
      * Get current coarse-grained voice call state.
      * If the Call Manager has an active call and call waiting occurs,