Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

chrome/renderer/spellchecker/spellcheck_provider_test.cc

 // 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.
 
 #include "chrome/renderer/spellchecker/spellcheck_provider_test.h"
 
 #include "base/stl_util.h"
 #include "chrome/common/spellcheck_marker.h"
 #include "chrome/common/spellcheck_messages.h"
 #include "chrome/renderer/spellchecker/spellcheck.h"
@@ skipping 22 matching lines @@
 TestingSpellCheckProvider::TestingSpellCheckProvider()
       : SpellCheckProvider(NULL, new MockSpellcheck),
         spelling_service_call_count_(0) {
 }
 
 TestingSpellCheckProvider::~TestingSpellCheckProvider() {
   delete spellcheck_;
 }
 
 bool TestingSpellCheckProvider::Send(IPC::Message* message)  {
+#if !defined(OS_MACOSX)
   // Call our mock message handlers.
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(TestingSpellCheckProvider, *message)
-#if !defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(SpellCheckHostMsg_CallSpellingService,
                         OnCallSpellingService)
-#endif
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   if (handled) {
     delete message;
     return true;
   }
+#endif
 
   messages_.push_back(message);
   return true;
 }
 
 void TestingSpellCheckProvider::OnCallSpellingService(int route_id,
                            int identifier,
                            const base::string16& text,
                            const std::vector<SpellCheckMarker>& markers) {
 #if defined (OS_MACOSX)
@@ skipping 19 matching lines @@
 }
 
 void TestingSpellCheckProvider::ResetResult() {
   text_.clear();
 }
 
 SpellCheckProviderTest::SpellCheckProviderTest() {}
 SpellCheckProviderTest::~SpellCheckProviderTest() {}