Add VPN settings classes to Settings app.

PATCH SET 2:
+ Add import com.android.settings.R

PATCH SET 3:
+ Remove @Override interface methods to be compilable by Java 1.5.

PATCH SET 4:
+ Add import android.net.vpn.VpnManager

PATCH SET 5:
+ Add license headers.

PATCH SET 6:
+ Remove Constant.java and move the constants to VpnSettings.
+ Make AuthenticationActor implement DialogInterface's handlers.
+ Remove trailing spaces.

PATCH SET 7:
+ Remove default username.
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f9758f3..2714457 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -110,6 +110,20 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".vpn.VpnSettings"
+                android:launchMode="singleTask">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <action android:name="android.net.vpn.SETTINGS" />
+                <action android:name="android.net.vpn.INSTALL_PROFILE" />
+                <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+
+        <activity android:name=".vpn.VpnTypeSelection"></activity>
+        <activity android:name=".vpn.VpnEditor"></activity>
+
         <activity android:name="DateTimeSettings" android:label="@string/date_and_time"
                 >
             <intent-filter>