Add a chrome://webapks page.

chrome/browser/android/webapk/webapk_info.h

Index: chrome/browser/android/webapk/webapk_info.h
diff --git a/chrome/browser/android/webapk/webapk_info.h b/chrome/browser/android/webapk/webapk_info.h
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+++ b/chrome/browser/android/webapk/webapk_info.h
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+// Copyright (c) 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.
+
+#ifndef CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INFO_H_
+#define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INFO_H_
+
+#include <string>
+
+// Structure with information about a WebAPK.
+struct WebApkInfo {
+  WebApkInfo(std::string short_name,
+             std::string package_name,
+             int shell_apk_version,
+             int version_code);
+  WebApkInfo(const WebApkInfo& other);
+  ~WebApkInfo();
+
+  // Short name of the WebAPK.
+  std::string short_name;
+
+  // Package name of the WebAPK.
+  std::string package_name;
+
+  // Shell APK version of the WebAPK.
+  int shell_apk_version;
+
+  // Version code of the WebAPK.
+  int version_code;
+};
+
+#endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INFO_H_