Move cache dir to its own class.

This prevents us from loading the RS static initializer all the time.

Change-Id: I8cea7540e50251aba8c2f199f06f344f991e7d7f

rs/java/android/renderscript/RenderScriptCacheDir.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2008-2015 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 android.renderscript;
+
+import java.io.File;
+
+/**
+ * Used only for tracking the RenderScript cache directory.
+ * @hide
+ */
+public class RenderScriptCacheDir {
+     /**
+     * Sets the directory to use as a persistent storage for the
+     * renderscript object file cache.
+     *
+     * @hide
+     * @param cacheDir A directory the current process can write to
+     */
+    public static void setupDiskCache(File cacheDir) {
+        // Defer creation of cache path to nScriptCCreate().
+        mCacheDir = cacheDir;
+    }
+
+    static File mCacheDir;
+
+}