Add a chrome://webapks page.

chrome/browser/ui/webui/webapks_handler.cc

Index: chrome/browser/ui/webui/webapks_handler.cc
diff --git a/chrome/browser/ui/webui/webapks_handler.cc b/chrome/browser/ui/webui/webapks_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..69d98c8cafda9393b7085fddbb48472075d876d6
--- /dev/null
+++ b/chrome/browser/ui/webui/webapks_handler.cc
@@ -0,0 +1,44 @@
+// 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/ui/webui/webapks_handler.h"
+
+#include "base/callback_forward.h"
+#include "base/values.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) {
+  AllowJavascript();
+  ShortcutHelper::RetrieveWebApks(base::Bind(
+      &WebApksHandler::OnWebApkInfoRetrieved, weak_ptr_factory_.GetWeakPtr()));
+}
+
+void WebApksHandler::OnWebApkInfoRetrieved(
+    const std::vector<WebApkInfo>& webapks_list) {
+  if (!IsJavascriptAllowed())
+    return;
+  base::ListValue list;
+  for (const auto& webapk_info : webapks_list) {
+    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));
+  }
+
+  CallJavascriptFunction("returnWebApksInfo", list);
+}