Add a chrome://webapks page.

chrome/browser/android/webapk/webapk_info.h

+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INFO_H_
+#define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INFO_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+// Structure with information about a WebAPK.
+//
+// This class is passed around in a std::vector to generate the chrome://webapks
+// page. To reduce copying overhead, this class is move-only, and
+// move-constructs its string arguments (which are copied from Java to C++ into
+// a temporary prior to construction).
+struct WebApkInfo {
+  WebApkInfo(std::string short_name,

[Dan Beam, 2017/01/27 21:52:14]

don't we want these to be const &, i.e. const std::string& short_name?

[dominickn, 2017/01/27 22:31:05]

No. Const ref arguments means the strings get copied into this object, losing
the move semantics. The arguments to this method come from a temporary vector
that's already been copied from Java and would be discarded after use anyway. 

[Dan Beam, 2017/01/27 22:40:21]

aight, feel free to ignore this then :)

+             std::string package_name,
+             int shell_apk_version,
+             int version_code);
+  ~WebApkInfo();
+
+  WebApkInfo& operator=(WebApkInfo&& other) = default;
+  WebApkInfo(WebApkInfo&& other) = default;
+
+  // 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;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebApkInfo);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INFO_H_