Upstream: Launch WebApkActivity from WebAPK.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity5.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity5.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity5.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity5.java
new file mode 100644
index 0000000000000000000000000000000000000000..5b199fb84200d8b1e824c81d23b80cf524b42fdc
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity5.java
@@ -0,0 +1,11 @@
+// Copyright 2016 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.webapps;
+
+/**
+ * Instance of WebApkActivity. Existence explained in WebApkManagedActivity.
+ */
+public class WebApkActivity5 extends WebApkManagedActivity {
+}