Layers 2.1 (backwards compatible)

This is a rework of the initial layers type 2 commit

Changes naming conventions to coexist with AOSP naming

Original commit:
Layers : Exposing hard coded resources for type 2 overlay access [6/6]
Author: bgill55
https://github.com/BitSyko/platform_packages_apps_InCallUI/commit/4abd6f39466cb74363a402de62b1858b963f79f0
diff --git a/res/layout/call_card_content.xml b/res/layout/call_card_content.xml
index a5fd8f7..54cb02f 100644
--- a/res/layout/call_card_content.xml
+++ b/res/layout/call_card_content.xml
@@ -54,7 +54,7 @@
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:visibility="gone"
             android:padding="@dimen/call_banner_side_padding"
-            android:background="@android:color/white" />
+            android:background="@color/background_white" />
 
     </LinearLayout>
 
@@ -67,7 +67,7 @@
         android:gravity="top|center_horizontal"
         android:scaleType="centerCrop"
         android:contentDescription="@string/contactPhoto"
-        android:background="@android:color/white"
+        android:background="@color/background_white"
         android:src="@drawable/img_no_image_automirrored" />
 
     <fragment android:name="com.android.incallui.VideoCallFragment"
diff --git a/res/values/custom_colors.xml b/res/values/custom_colors.xml
new file mode 100644
index 0000000..4d1b666
--- /dev/null
+++ b/res/values/custom_colors.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2007 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
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     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.
+-->
+
+<resources>
+    <color name="background_white">@color/exposed_bg_dark</color>
+</resources> 
diff --git a/res/values/layers_colors.xml b/res/values/layers_colors.xml
new file mode 100644
index 0000000..58d127e
--- /dev/null
+++ b/res/values/layers_colors.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2007 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
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     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.
+-->
+
+<resources>
+    <!-- Exposed colors for theming -->
+    <color name="exposed_bg_dark">@android:color/white</color>
+</resources>