Revert "Move frameworks/base/tools/ to frameworks/tools/"

This reverts commit 9f6a119c8aa276432ece4fe2118bd8a3c9b1067e.
diff --git a/bridge/src/android/os/Build_Delegate.java b/bridge/src/android/os/Build_Delegate.java
new file mode 100644
index 0000000..ff82a5e
--- /dev/null
+++ b/bridge/src/android/os/Build_Delegate.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2011 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.os;
+
+import com.android.layoutlib.bridge.Bridge;
+import com.android.layoutlib.bridge.impl.DelegateManager;
+import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
+
+import java.util.Map;
+
+/**
+ * Delegate implementing the native methods of android.os.Build
+ *
+ * Through the layoutlib_create tool, the original native methods of Build have been replaced
+ * by calls to methods of the same name in this delegate class.
+ *
+ * Because it's a stateless class to start with, there's no need to keep a {@link DelegateManager}
+ * around to map int to instance of the delegate.
+ *
+ */
+public class Build_Delegate {
+
+    @LayoutlibDelegate
+    /*package*/ static String getString(String property) {
+        Map<String, String> properties = Bridge.getPlatformProperties();
+        String value = properties.get(property);
+        if (value != null) {
+            return value;
+        }
+
+        return Build.UNKNOWN;
+    }
+
+}