[Presentation API, Android] Implement closing the route

chrome/android/java/src/org/chromium/chrome/browser/media/router/cast/SessionWrapper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/router/cast/SessionWrapper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/router/cast/SessionWrapper.java b/chrome/android/java/src/org/chromium/chrome/browser/media/router/cast/SessionWrapper.java
new file mode 100644
index 0000000000000000000000000000000000000000..c1f99a9e6efc38bdfc466d024caa79814c1da66b
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/router/cast/SessionWrapper.java
@@ -0,0 +1,40 @@
+// Copyright 2015 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.chrome.browser.media.router.cast;
+
+import com.google.android.gms.cast.Cast;
+import com.google.android.gms.common.api.GoogleApiClient;
+
+/**
+ * A wrapper around the established Cast application session.
+ */
+public class SessionWrapper {
+    private GoogleApiClient mApiClient;
+    private String mSessionId;
+
+    /**
+     * Initializes a new {@link SessionWrapper} instance.
+     * @param apiClient Google Play Services client used to create the session.
+     * @param sessionId the session identifier to use with the Cast SDK.
+     */
+    public SessionWrapper(GoogleApiClient apiClient, String sessionId) {
+        mApiClient = apiClient;
+        mSessionId = sessionId;
+    }
+
+    /**
+     * Stops the Cast application associated with this session.
+     */
+    public void stop() {
+        assert mApiClient != null;
+
+        if (mApiClient.isConnected() || mApiClient.isConnecting()) {
+            Cast.CastApi.stopApplication(mApiClient, mSessionId);
+        }
+
+        mSessionId = null;
+        mApiClient = null;
+    }
+}