[sync] Add java InvalidationController for Android.

sync/android/java/src/org/chromium/sync/internal_api/pub/base/ModelType.java

Index: sync/android/java/src/org/chromium/sync/internal_api/pub/base/ModelType.java
diff --git a/sync/android/java/src/org/chromium/sync/internal_api/pub/base/ModelType.java b/sync/android/java/src/org/chromium/sync/internal_api/pub/base/ModelType.java
new file mode 100644
index 0000000000000000000000000000000000000000..4dbdab0a76a9dd634058d8a112513b8cda3b82fe
--- /dev/null
+++ b/sync/android/java/src/org/chromium/sync/internal_api/pub/base/ModelType.java
@@ -0,0 +1,46 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.sync.internal_api.pub.base;
+
+import com.google.ipc.invalidation.external.client.types.ObjectId;
+import com.google.protos.ipc.invalidation.Types;
+
+/**
+ * The model types that are synced in Chrome for Android.
+ */
+public enum ModelType {
+
+    /**
+     * A bookmark folder or a bookmark URL object.
+     */
+    BOOKMARK("BOOKMARK"),
+    /**
+     * A typed_url folder or a typed_url object.
+     */
+    TYPED_URL("TYPED_URL"),
+    /**
+     * An object representing a browser session or tab.
+     */
+    SESSION("SESSION");
+
+    private final String mModelType;
+
+    ModelType(String modelType) {
+        mModelType = modelType;
+    }
+
+    public ObjectId toObjectId() {
+        return ObjectId.newInstance(Types.ObjectSource.Type.CHROME_SYNC.getNumber(),
+                mModelType.getBytes());
+    }
+
+    public static ModelType fromObjectId(ObjectId objectId) {
+        try {
+            return valueOf(new String(objectId.getName()));
+        } catch (IllegalArgumentException e) {
+            return null;
+        }
+    }
+}