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 "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/webapk_info_callback.h"
+#include "chrome/grit/generated_resources.h"
+#include "components/strings/grit/components_strings.h"
+#include "components/webapks_ui/webapks_ui_constants.h"
+#include "content/public/browser/web_ui.h"
+
+WebApksHandler::WebApksHandler() : weak_ptr_factory_(this) {}
+
+WebApksHandler::~WebApksHandler() {}
+
+void WebApksHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      webapks_ui::kRequestWebApksInfo,
+      base::Bind(&WebApksHandler::HandleRequestWebApksInfo,
+                 base::Unretained(this)));
+}
+
+void WebApksHandler::HandleRequestWebApksInfo(const base::ListValue* args) {
+  base::RepeatingCallback<void(std::string, std::string, int, int)> callback =
+      base::BindRepeating(&WebApksHandler::OnWebApkInfoReceived,
+                          weak_ptr_factory_.GetWeakPtr());

[Xi Han, 2017/01/16 16:56:19]

Please add a commend here: "WebApkInfoCallback will delete itself after it is
done."

[gonzalon, 2017/01/16 19:50:44]

Done.

+  WebApkInfoCallback* webapk_info_callback = new WebApkInfoCallback(callback);
+  webapk_info_callback->MakeInfoRequest(base::android::AttachCurrentThread());
+}
+
+void WebApksHandler::OnWebApkInfoReceived(std::string name,
+                                          std::string package_name,
+                                          int shell_apk_version,
+                                          int version_code) {
+  base::StringValue name_value(name);
+  base::StringValue package_name_value(package_name);
+  base::FundamentalValue shell_apk_version_value(shell_apk_version);
+  base::FundamentalValue version_code_value(version_code);
+  web_ui()->CallJavascriptFunctionUnsafe(
+      webapks_ui::kReturnWebApksInfo, name_value, package_name_value,
+      shell_apk_version_value, version_code_value);
+}