Add a callstack to the known crashes list. This crash occurs consistently in ...

chrome/test/data/reliability/known_crashes.txt

Index: chrome/test/data/reliability/known_crashes.txt
===================================================================
--- chrome/test/data/reliability/known_crashes.txt	(revision 52935)
+++ chrome/test/data/reliability/known_crashes.txt	(working copy)
@@ -70,3 +70,7 @@
 ntdll!RtlLeaveCriticalSection+0x1d
 chrome_2610000!ResourceMessageFilter::OnLoadFont+0x179 [c:\b\slave\chromium-rel-xp\build\src\chrome\browser\renderer_host\resource_message_filter.cc @ 716]
 chrome_2610000!IPC::MessageWithReply<Tuple1<tagLOGFONTW>,Tuple0>::Dispatch<ResourceMessageFilter,void (__thiscall ResourceMessageFilter::*)(tagLOGFONTW)>+0x7a [c:\b\slave\chromium-rel-xp\build\src\ipc\ipc_message_utils.h @ 1183]
+
+# 39356
+PREFIX: renderwidgethost::onmsgupdaterect___ipc::messagewithtuple<tuple1<viewhostmsg_updaterect_params> >::dispatch<renderwidgethost,void (__thiscall renderwidgethost::*)(viewhostmsg_updaterect_params const &)>___renderwidgethost::onmessagereceived___renderviewhost::onmessagereceived___browserrenderprocesshost::onmessagereceived___renderwidgethelper::updatemsgproxy::run___messageloop::runtask___messageloop::dowork___base::messagepumpforui::dorunloop___base::messagepumpwin::runwithdispatcher___messageloop::runinternal___messageloopforui::run___`anonymous namespace'::runuimessageloop___browsermain___chromemain___maindllloader::launch___wwinmain_____tmaincrtstartup
+