Add an intermediate dimens resource for 540dp device.

A 540dp device causes keyguard to select SlidingChallengeLayout
and a height of 400dp which isn't enough space for the security
area.  This fix adds an intermediate value to grow the security
area slightly.

Fixes bug 11344424

Change-Id: I35c979f619c593b604e4bf45afd3e591329229e4
diff --git a/packages/Keyguard/res/values-sw540dp-port/dimens.xml b/packages/Keyguard/res/values-sw540dp-port/dimens.xml
new file mode 100644
index 0000000..de3106f
--- /dev/null
+++ b/packages/Keyguard/res/values-sw540dp-port/dimens.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+/* //device/apps/common/assets/res/any/dimens.xml
+** Copyright 2013, The Android Open Source Project
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+    <!-- Height of the sliding KeyguardSecurityContainer
+        (includes 2x keyguard_security_view_margin) -->
+    <dimen name="keyguard_security_height">500dp</dimen>