Adding the chrome://copresence page

chrome/browser/ui/webui/copresence_ui_handler.h

+// Copyright 2014 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_COPRESENCE_UI_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_COPRESENCE_UI_HANDLER_H_
+
+#include <vector>

[Dan Beam, 2014/12/09 05:33:39]

unused?

[Charlie, 2014/12/17 23:39:56]

Yep. Nixed.

+
+#include "base/macros.h"
+#include "components/copresence/public/copresence_observer.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace content {
+class WebUI;
+}
+
+namespace copresence {
+class CopresenceState;
+}
+
+// UI Handler for the copresence page.
+// TODO(ckehoe): Write tests.

[Dan Beam, 2014/12/09 05:33:39]

why not just write the tests?

[Charlie, 2014/12/17 23:39:56]

Haha. You haven't worked with my manager :-)

This is a debug UI for an as yet internal-only Chrome service. Breakages are
both more likely to be noticed and much less problematic than for a typical
Chrome feature.

I do like well-tested code, and I wish I had the time to write tests for this
right now. If the browsertest infrastructure was easier to use, or at least more
familiar to me, I'd do it in this CL. But I think leaving tests as a TODO is the
best decision for our team right now.

[Dan Beam, 2014/12/20 00:10:29]

i'd just do this todo or remove it as it's a waste of bits otherwise (as I'm not
confident it'll ever get done).

[Charlie, 2014/12/20 02:04:51]

Not only do I plan to do it, but I can tell you that it'll probably be in the
M43 timeframe. Filed a bug. M42 will be really busy for us, since we're planning
to launch two new APIs.

+class CopresenceUIHandler final : public content::WebUIMessageHandler,
+                                  public copresence::CopresenceObserver {
+ public:
+  explicit CopresenceUIHandler(content::WebUI* web_ui);
+  ~CopresenceUIHandler() override;
+
+ private:
+  // WebUIMessageHandler override.
+  void RegisterMessages() override;
+
+  // CopresenceObserver overrides.
+  void DirectivesUpdated() override;
+  void TokenSent(const copresence::SentToken& token) override;
+  void TokenReceived(const copresence::ReceivedToken& token) override;
+
+  // Handler to populate the page with its initial state.
+  void HandlePopulateState(const base::ListValue* args);
+
+  copresence::CopresenceState* state_;
+
+  DISALLOW_COPY_AND_ASSIGN(CopresenceUIHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_COPRESENCE_UI_HANDLER_H_