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 539 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 366 matching lines @@
   while (!queued_messages_.empty()) {
     Send(queued_messages_.front());
     queued_messages_.pop();
   }
 }
 
 void BrowserRenderProcessHost::OnUserMetricsRecordAction(
     const std::string& action) {
   UserMetrics::RecordComputedAction(action);
 }