Bug 1402824 - Add missing includes in PrioritizedEventQueue to fix non-unified build. r=billm

InputEventStatistics::Get() requires the InputEventStatistics.h #include.
MakeScopeExit() requires the ScopeExit.h #include.
LabeledEventQueue.h is required for the PrioritizedEventQueue class.

MozReview-Commit-ID: 7gRwhV3YQXw

--HG--
extra : rebase_source : 54b56317b2876db2ed679e9f47ffb87fdf83cdd2

xpcom/threads/PrioritizedEventQueue.cpp

@@ -6,8 +6,10 @@
 
 #include "PrioritizedEventQueue.h"
 #include "mozilla/EventQueue.h"
+#include "mozilla/ScopeExit.h"
 #include "nsThreadManager.h"
 #include "nsXPCOMPrivate.h" // for gXPCOMThreadsShutDown
+#include "InputEventStatistics.h"
 
 using namespace mozilla;
 

xpcom/threads/PrioritizedEventQueue.h

@@ -8,6 +8,7 @@
 #define mozilla_PrioritizedEventQueue_h
 
 #include "mozilla/AbstractEventQueue.h"
+#include "LabeledEventQueue.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/TypeTraits.h"
 #include "mozilla/UniquePtr.h"