Add a crash key to record whether a windows machine is domain joined.

chrome/common/crash_keys.cc

Index: chrome/common/crash_keys.cc
diff --git a/chrome/common/crash_keys.cc b/chrome/common/crash_keys.cc
index 800f7045f41aa64b88fed3fd4a3250f97583fa27..7b570cf750f96ab2262891f0157653b8d9051f25 100644
--- a/chrome/common/crash_keys.cc
+++ b/chrome/common/crash_keys.cc
@@ -58,6 +58,8 @@ const char kHungRendererReason[] = "hung-reason";
 
 const char kThirdPartyModulesLoaded[] = "third-party-modules-loaded";
 const char kThirdPartyModulesNotLoaded[] = "third-party-modules-not-loaded";
+
+const char kDomainJoined[] = "domain-joined";
 #endif
 
 const char kInputEventFilterSendFailure[] = "input-event-filter-send-failure";