Add a new IResourceValue that knows about the density.

This will allow the layoutlib to resize bitmaps that are
not in the native density of the rendering.

This is integrated from the Eclair branch.
DO NOT MERGE.

tools/layoutlib/api/src/com/android/layoutlib/api/IDensityBasedResourceValue.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+package com.android.layoutlib.api;
+
+/**
+ * Represents an Android Resources that has a density info attached to it.
+ */
+public interface IDensityBasedResourceValue extends IResourceValue {
+    public static enum Density {
+        HIGH, MEDIUM, LOW, NODPI;
+    }
+
+    /**
+     * Returns the density associated to the resource.
+     */
+    Density getDensity();
+}