TimeStats & FrameTracer: refactor layerID to layerId

Test: build, flash and boot
Test: atest libsurfaceflinger_unittest
Change-Id: I297dce08dbaf625b56e1e6d47cffead1de440ab7
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index d5a9ae1..3757fc7 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -1356,9 +1356,9 @@
 void Layer::onDisconnect() {
     Mutex::Autolock lock(mFrameEventHistoryMutex);
     mFrameEventHistory.onDisconnect();
-    const int32_t layerID = getSequence();
-    mFlinger->mTimeStats->onDestroy(layerID);
-    mFlinger->mFrameTracer->onDestroy(layerID);
+    const int32_t layerId = getSequence();
+    mFlinger->mTimeStats->onDestroy(layerId);
+    mFlinger->mFrameTracer->onDestroy(layerId);
 }
 
 void Layer::addAndGetFrameTimestamps(const NewFrameEventsEntry* newTimestamps,