Skeleton of sync handler on the I/O thread for GetSearchProviderInstallState.

chrome/browser/search_engines/search_provider_install_state_dispatcher_host.h

+// Copyright (c) 2010 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_SEARCH_ENGINES_SEARCH_PROVIDER_INSTALL_STATE_DISPATCHER_HOST_H_
+#define CHROME_BROWSER_SEARCH_ENGINES_SEARCH_PROVIDER_INSTALL_STATE_DISPATCHER_HOST_H_
+
+#include "base/basictypes.h"
+
+namespace IPC {
+class Message;
+}
+
+class GURL;
+class Profile;
+class ResourceMessageFilter;
+struct ViewHostMsg_GetSearchProviderInstallState_Params;
+
+// Handles messages regarding search provider install state on the I/O thread.
+class SearchProviderInstallStateDispatcherHost {
+ public:
+  SearchProviderInstallStateDispatcherHost(ResourceMessageFilter* ipc_sender,

[sky, 2010/08/23 16:00:29]

Mention this is invoked on the UI thread.

+                                           Profile* profile);
+  ~SearchProviderInstallStateDispatcherHost();
+
+  // Send a message to the renderer process.
+  void Send(IPC::Message* message);
+
+  // Called to possibly handle the incoming IPC message. Returns true if
+  // handled.
+  bool OnMessageReceived(const IPC::Message& message, bool* message_was_ok);
+
+ private:
+  // Figures out the install state for the search provider.
+  ViewHostMsg_GetSearchProviderInstallState_Params
+      GetSearchProviderInstallState(const GURL& page_location,
+                                    const GURL& requested_host);
+
+  // Starts handling the message requesting the search provider install state.
+  void OnMsgGetSearchProviderInstallState(const GURL& page_location,
+                                          const GURL& requested_host,
+                                          IPC::Message* reply_msg);
+
+  // Sends the reply message about the search provider install state.
+  void ReplyWithProviderInstallState(
+      IPC::Message* reply_msg,
+      ViewHostMsg_GetSearchProviderInstallState_Params install_state);
+
+  ResourceMessageFilter* ipc_sender_;
+  const bool is_off_the_record_;
+
+  DISALLOW_COPY_AND_ASSIGN(SearchProviderInstallStateDispatcherHost);
+};
+
+#endif  // CHROME_BROWSER_SEARCH_ENGINES_SEARCH_PROVIDER_INSTALL_STATE_DISPATCHER_HOST_H_