Refactor AndroidKeyStore to allow remote key handling.

net/android/java/src/org/chromium/net/AndroidKeyStoreRemote.java

+// Copyright 2014 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.net;
+
+/**
+ * TODO(ppi)
+ */
+public abstract class AndroidKeyStoreRemote implements AndroidKeyStore {
+    private static final String TAG = "AndroidKeyStoreRemote";
+
+    protected static class RemotePrivateKey implements AndroidPrivateKey {
+        // Alias of the key on a remote store.
+        final String mHandle;
+        // Key store handling this key.
+        final AndroidKeyStoreRemote mStore;
+
+        RemotePrivateKey(String handle, AndroidKeyStoreRemote store) {
+            mHandle = handle;
+            mStore = store;
+        }
+
+        public String getHandle() {
+            return mHandle;
+        }
+
+        @Override
+        public AndroidKeyStore getKeyStore() {
+            return mStore;
+        }
+    }
+
+    public AndroidPrivateKey createKey(String handle) {
+        return new RemotePrivateKey(handle, this);
+    }
+}