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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index b992b2242177f9ef0df5d40a56f2fe9bf1a33994..dfd33bd7dc6799e77db0356604251bbad379f2a1 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -732,6 +732,10 @@ const char kDisableJavaScriptHarmonyShipping[] =
 // Enables experimental Harmony (ECMAScript 6) features.
 const char kJavaScriptHarmony[]             = "javascript-harmony";
 
+// Dumps IPC messages sent from renderer processes to the browser process to
+// the given directory. Used primarily to gather samples for IPC fuzzing.
+const char kIpcDumpDirectory[] = "ipc-dump-directory";
+
 // Specifies the testcase used by the IPC fuzzer.
 const char kIpcFuzzerTestcase[]             = "ipc-fuzzer-testcase";