Add a chrome://webapks page.

chrome/browser/ui/webui/webapks_handler.cc

+// 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.
+
+#include "chrome/browser/ui/webui/webapks_handler.h"
+
+#include "base/callback_forward.h"
+#include "chrome/browser/android/shortcut_helper.h"
+#include "content/public/browser/web_ui.h"
+
+WebApksHandler::WebApksHandler() : weak_ptr_factory_(this) {}
+
+WebApksHandler::~WebApksHandler() {}
+
+void WebApksHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback("requestWebApksInfo",
+      base::Bind(&WebApksHandler::HandleRequestWebApksInfo,
+                 base::Unretained(this)));
+}
+
+void WebApksHandler::HandleRequestWebApksInfo(const base::ListValue* args) {
+  // The WebApkInfoCallback will delete itself after it is done.

[pkotwicz, 2017/01/20 16:57:17]

Nit: Delete the comment.

I think that commenting about the lifetime of an object is only useful if the
object is created via new.

[gonzalon, 2017/01/20 19:27:01]

Done.

+  ShortcutHelper::ListWebApks(base::Bind(
+      &WebApksHandler::OnWebApkInfoReceived, weak_ptr_factory_.GetWeakPtr()));
+}
+
+void WebApksHandler::OnWebApkInfoReceived(
+    std::vector<const WebApkInfo> webapks_list) {
+  base::ListValue list;
+  for (size_t i = 0; i < webapks_list.size(); ++i) {
+    const WebApkInfo webapk_info = webapks_list[i];
+    std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue());
+    result->SetString("shortName", webapk_info.short_name);
+    result->SetString("packageName", webapk_info.package_name);
+    result->SetInteger("shellApkVersion", webapk_info.shell_apk_version);
+    result->SetInteger("versionCode", webapk_info.version_code);
+    list.Append(std::move(result));
+  }
+
+  web_ui()->CallJavascriptFunctionUnsafe("returnWebApksInfo", list);
+}