Add a flag to dump IPC messages sent from the renderer to the browser.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 7ce95d4ec3638207b55e071e0bb0168e30c525b8..42f0ec3c5eae7cdd81008b54872ae04b9de14192 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1331,7 +1331,8 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
 
 #if defined(ENABLE_IPC_FUZZER)
   static const char* const kIpcFuzzerSwitches[] = {
-    switches::kIpcFuzzerTestcase,
+      switches::kIpcDumpDirectory,
+      switches::kIpcFuzzerTestcase,
   };
   command_line->CopySwitchesFrom(browser_command_line, kIpcFuzzerSwitches,
                                  arraysize(kIpcFuzzerSwitches));