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..852c69446ca115bebb85ca87e180260386855599
--- /dev/null
+++ b/chrome/browser/ui/webui/webapks_handler.h
@@ -0,0 +1,42 @@
+// 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 <string>

[pkotwicz, 2017/01/19 19:37:17]

I don't think this include is needed

[gonzalon, 2017/01/19 23:50:17]

Done.

+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"

[pkotwicz, 2017/01/19 19:37:17]

Nit: You can forward declare base::ListValue and move the include to the .cc
file

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

^^^ I think that you missed this comment

+#include "chrome/browser/android/webapk/webapk_info.h"

[pkotwicz, 2017/01/19 19:37:17]

I think you can also forward declare WebApkInfo

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

^^^ I think that you missed this comment

+#include "content/public/browser/web_ui_message_handler.h"
+
+// Handler class for WebAPKs page operations.

[pkotwicz, 2017/01/19 19:37:17]

How about: "Handles JavaScript messages from the chrome://webapks page."

[gonzalon, 2017/01/19 23:50:17]

Done.

+class WebApksHandler : public content::WebUIMessageHandler {
+ public:
+  WebApksHandler();
+  ~WebApksHandler() override;
+
+  // content::WebUIMessageHandler implementation.
+  void RegisterMessages() override;
+
+  // Callback for the "requestWebApksInfo" message. This requests the WebAPKs
+  // information from the device and returns it to the front end using
+  // OnWebApkInfoReceived

[pkotwicz, 2017/01/19 19:37:17]

How about: "Handler for the "requestWebApksInfo" message. This requests
information for the installed WebAPKs and returns it to JS using
OnWebApkInfoReceived()."

- I think that putting the () makes it obvious that a method is a method
- I think that "from the device" is redundant.

[gonzalon, 2017/01/19 23:50:17]

Done.

+  virtual void HandleRequestWebApksInfo(const base::ListValue* args);
+
+ private:
+  // Callback which handles returning the information of a single WebAPK to the
+  // front end.

[pkotwicz, 2017/01/19 19:37:17]

This comment looks out of date. How about:
"Sends information for the installed WebAPKs to JS."

[gonzalon, 2017/01/19 23:50:17]

Done.

+  void OnWebApkInfoReceived(std::vector<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_