Add code to prompt for browser login during app notification setup

chrome/browser/extensions/app_notify_channel_ui.h

+// Copyright (c) 2011 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_EXTENSIONS_APP_NOTIFY_CHANNEL_UI_H_
+#define CHROME_BROWSER_EXTENSIONS_APP_NOTIFY_CHANNEL_UI_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/sync/profile_sync_service_observer.h"
+
+class Browser;
+class TabContentsWrapper;
+
+// An interface for prompting a user to sign in to sync so that we can create
+// an app notification channel for one of their apps.
+class AppNotifyChannelUI {
+ public:
+  virtual ~AppNotifyChannelUI() {}
+
+  class Delegate {
+   public:
+    // A callback for whether the user successfully set up sync or not.
+    virtual void OnSyncSetupResult(bool enabled) = 0;
+  };
+
+  // Shows a prompt for sync setup - |delegate| will be called back later when
+  // setup is complete or cancelled. This should only be called once per
+  // instance.
+  virtual void PromptSyncSetup(Delegate* delegate) = 0;
+};
+
+
+class AppNotifyChannelUIImpl : public AppNotifyChannelUI,
+                               public ProfileSyncServiceObserver {
+ public:
+  AppNotifyChannelUIImpl(Browser* browser,
+                         TabContentsWrapper* wrapper,
+                         const std::string& app_name);
+  virtual ~AppNotifyChannelUIImpl();
+
+  // AppNotifyChannelUI.
+  virtual void PromptSyncSetup(AppNotifyChannelUI::Delegate* delegate) OVERRIDE;
+
+ protected:
+  // A private class we use to put up an infobar - its lifetime is managed by
+  // |wrapper_|, so we don't have one as an instance variable.
+  class InfoBar;
+  friend class AppNotifyChannelUIImpl::InfoBar;
+
+  // Called by our InfoBar when it's accepted or cancelled/closed.
+  void OnInfoBarResult(bool accepted);
+
+  // ProfileSyncServiceObserver.
+  virtual void OnStateChanged() OVERRIDE;
+
+ private:
+  void StartObservingSync();
+  void StopObservingSync();
+
+  Browser* browser_;
+  TabContentsWrapper* wrapper_;
+  std::string app_name_;
+  AppNotifyChannelUI::Delegate* delegate_;
+
+  // Have we registered ourself as a ProfileSyncServiceObserver?
+  bool observing_sync_;
+
+  // This is for working around a bug where the first ProfileSyncServiceObserver
+  // callback after starting the sync login process erroneously reports
+  // SetupInProgress as false. See crbug.com/101842.
+  bool got_first_sync_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppNotifyChannelUIImpl);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_APP_NOTIFY_CHANNEL_UI_H_