linux: Crash browser on too-big messages to zygote.

content/browser/zygote_host/zygote_host_impl_linux.h

Index: content/browser/zygote_host/zygote_host_impl_linux.h
diff --git a/content/browser/zygote_host/zygote_host_impl_linux.h b/content/browser/zygote_host/zygote_host_impl_linux.h
index 460abc51c2229a7b6e9c6f3ad2c72ba9a844e653..8548a2ba16c2240d9ff04e1d0fb1b476693d150a 100644
--- a/content/browser/zygote_host/zygote_host_impl_linux.h
+++ b/content/browser/zygote_host/zygote_host_impl_linux.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "base/pickle.h"
 #include "base/process_util.h"
 #include "base/synchronization/lock.h"
 #include "content/public/browser/file_descriptor_info.h"
@@ -47,9 +48,15 @@ class CONTENT_EXPORT ZygoteHostImpl : public content::ZygoteHost {
 
  private:
   friend struct DefaultSingletonTraits<ZygoteHostImpl>;
+
   ZygoteHostImpl();
   virtual ~ZygoteHostImpl();
 
+  // Sends |data| to the zygote via |control_fd_|.  If |fds| is non-NULL, the
+  // included file descriptors will also be passed.  The caller is responsible
+  // for acquiring |control_lock_|.
+  bool SendMessage(const Pickle& data, const std::vector<int>* fds);
+
   ssize_t ReadReply(void* buf, size_t buflen);
 
   int control_fd_;  // the socket to the zygote