Add a chrome://webapks page.

chrome/browser/android/webapk/webapk_info.cc

Index: chrome/browser/android/webapk/webapk_info.cc
diff --git a/chrome/browser/android/webapk/webapk_info.cc b/chrome/browser/android/webapk/webapk_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d97a469a708e401abe88522c921691abcd31ae8b
--- /dev/null
+++ b/chrome/browser/android/webapk/webapk_info.cc
@@ -0,0 +1,16 @@
+// Copyright 2017 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.
+
+#include "chrome/browser/android/webapk/webapk_info.h"
+
+WebApkInfo::WebApkInfo(std::string short_name,
+                       std::string package_name,
+                       int shell_apk_version,
+                       int version_code)
+    : short_name(short_name),
+      package_name(package_name),
+      shell_apk_version(shell_apk_version),
+      version_code(version_code) {}
+
+WebApkInfo::~WebApkInfo() {}