Take 'sources' argument by const reference

Bug: b/270049345
Test: atest inputflinger_tests:LatencyTrackerTest
Flag: NONE adding a reference

Change-Id: I0568ea90da984ae6f906d8bf018de9a423834858
diff --git a/services/inputflinger/dispatcher/InputEventTimeline.cpp b/services/inputflinger/dispatcher/InputEventTimeline.cpp
index a7c6d16..a365003 100644
--- a/services/inputflinger/dispatcher/InputEventTimeline.cpp
+++ b/services/inputflinger/dispatcher/InputEventTimeline.cpp
@@ -68,7 +68,7 @@
 
 InputEventTimeline::InputEventTimeline(bool isDown, nsecs_t eventTime, nsecs_t readTime,
                                        uint16_t vendorId, uint16_t productId,
-                                       std::set<InputDeviceUsageSource> sources)
+                                       const std::set<InputDeviceUsageSource>& sources)
       : isDown(isDown),
         eventTime(eventTime),
         readTime(readTime),