surfaceflinger: use std::queue for mPendingEvents

Replace Vector by std::queue for mPendingEvents.  It is used for
pending hotplug events, which happen rarely and are consumed one by
one quickly by an RT thread.  std::queue is likely no better than
std::vector in that scenario, but is more expressive.

Bug: 115738279
Test: boots
Change-Id: Ia906a7f08ecbe6d5534cd6ec42e5af2ac865a911
diff --git a/services/surfaceflinger/Scheduler/EventThread.h b/services/surfaceflinger/Scheduler/EventThread.h
index 127891e..3879ae4 100644
--- a/services/surfaceflinger/Scheduler/EventThread.h
+++ b/services/surfaceflinger/Scheduler/EventThread.h
@@ -22,6 +22,7 @@
 #include <condition_variable>
 #include <cstdint>
 #include <mutex>
+#include <queue>
 #include <thread>
 
 #include <android-base/thread_annotations.h>
@@ -168,7 +169,7 @@
 
     // protected by mLock
     SortedVector<wp<Connection>> mDisplayEventConnections GUARDED_BY(mMutex);
-    Vector<DisplayEventReceiver::Event> mPendingEvents GUARDED_BY(mMutex);
+    std::queue<DisplayEventReceiver::Event> mPendingEvents GUARDED_BY(mMutex);
     std::array<DisplayEventReceiver::Event, 2> mVSyncEvent GUARDED_BY(mMutex);
     bool mUseSoftwareVSync GUARDED_BY(mMutex) = false;
     bool mVsyncEnabled GUARDED_BY(mMutex) = false;