Add a chrome://webapks page.

chrome/browser/ui/webui/webapks_handler.h

Index: chrome/browser/ui/webui/webapks_handler.h
diff --git a/chrome/browser/ui/webui/webapks_handler.h b/chrome/browser/ui/webui/webapks_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..5c79ac7caa392d5747aa72dd71817ebbefc9941b
--- /dev/null
+++ b/chrome/browser/ui/webui/webapks_handler.h
@@ -0,0 +1,40 @@
+// 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_UI_WEBUI_WEBAPKS_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_WEBAPKS_HANDLER_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "chrome/browser/android/webapk/webapk_info.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+// Handles JavaScript messages from the chrome://webapks page.
+class WebApksHandler : public content::WebUIMessageHandler {
+ public:
+  WebApksHandler();
+  ~WebApksHandler() override;
+
+  // content::WebUIMessageHandler implementation.

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

Nit: "content::WebUIMessageHandler implementation." ->
"content::WebUIMessageHandler:"
This is the new way of doing these comments

e.g. chrome/browser/ui/webui/policy_material_design_ui.cc

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

Done.

+  void RegisterMessages() override;
+
+  // Handler for the "requestWebApksInfo" message. This requests
+  // information for the installed WebAPKs and returns it to JS using
+  // OnWebApkInfoReceived().
+  virtual void HandleRequestWebApksInfo(const base::ListValue* args);
+
+ private:
+  // Sends information for the installed WebAPKs to JS.
+  void OnWebApkInfoReceived(std::vector<const WebApkInfo> webapks_list);
+
+  // Factory for the creating refs in callbacks.
+  base::WeakPtrFactory<WebApksHandler> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebApksHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_WEBAPKS_HANDLER_H_