Example of how to interpose yourself in a message stream.

content/browser/renderer_host/browser_render_process_host.cc

 // 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 571 matching lines @@
     switches::kDomAutomationController,
     switches::kDumpHistogramsOnExit,
     switches::kEnableAcceleratedDecoding,
     switches::kEnableAdaptive,
     switches::kEnableBenchmarking,
     switches::kEnableClickToPlay,
     switches::kEnableCrxlessWebApps,
     switches::kEnableDCHECK,
     switches::kEnableExperimentalExtensionApis,
     switches::kEnableInBrowserThumbnailing,
+    switches::kEnableIPCFuzzing,
     switches::kEnableLogging,
     switches::kEnableNaCl,
     switches::kEnableOpenMax,
 #if defined(ENABLE_P2P_APIS)
     switches::kEnableP2PApi,
 #endif
     switches::kEnablePepperTesting,
     switches::kEnablePrintPreview,
     switches::kEnableQuota,
     switches::kEnableRemoting,
@@ skipping 484 matching lines @@
     IPC::PlatformFileForTransit file;
 #if defined(OS_POSIX)
     file = base::FileDescriptor(model_file, false);
 #elif defined(OS_WIN)
     ::DuplicateHandle(::GetCurrentProcess(), model_file, GetHandle(), &file, 0,
                       false, DUPLICATE_SAME_ACCESS);
 #endif
     Send(new SafeBrowsingMsg_SetPhishingModel(file));
   }
 }