Asynchronous spellchecking on Win and Linux

chrome/common/spellcheck_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for spellcheck.
 // Multiply-included message file, hence no include guard.
 
 #include "chrome/common/spellcheck_result.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 28 matching lines @@
 IPC_MESSAGE_CONTROL1(SpellCheckMsg_WordAdded,
                      std::string /* word */)
 
 // Toggle the auto spell correct functionality.
 IPC_MESSAGE_CONTROL1(SpellCheckMsg_EnableAutoSpellCorrect,
                      bool /* enable */)
 
 #if !defined(OS_MACOSX)
 // Sends text-check results from the Spelling service when the service finishes
 // checking text reveived by a SpellCheckHostMsg_CallSpellingService message.
-IPC_MESSAGE_ROUTED3(SpellCheckMsg_RespondSpellingService,
-                    int        /* request identifier given by WebKit */,
-                    int        /* offset */,
+// If the service is not available, the 4th parameter should be false and
+// the 5th parameter should contain the requested setence.
+IPC_MESSAGE_ROUTED5(SpellCheckMsg_RespondSpellingService,
+                    int         /* request identifier given by WebKit */,
+                    int         /* offset */,
+                    bool        /* succeeded calling serivce */,
+                    string16    /* sentence */,
                     std::vector<SpellCheckResult>)
 #endif
 
 #if defined(OS_MACOSX)
 // This message tells the renderer to advance to the next misspelling. It is
 // sent when the user clicks the "Find Next" button on the spelling panel.
 IPC_MESSAGE_ROUTED0(SpellCheckMsg_AdvanceToNextMisspelling)
 
 // Sends when NSSpellChecker finishes checking text received by a preceeding
 // SpellCheckHostMsg_RequestTextCheck message.
@@ skipping 60 matching lines @@
 IPC_MESSAGE_CONTROL4(SpellCheckHostMsg_RequestTextCheck,
                      int /* route_id for response */,
                      int /* request identifier given by WebKit */,
                      int /* document tag */,
                      string16 /* sentence */)
 
 IPC_MESSAGE_ROUTED2(SpellCheckHostMsg_ToggleSpellCheck,
                     bool /* enabled */,
                     bool /* checked */)
 #endif  // OS_MACOSX