SF: Add thread saftey static analysis for InputWindowCommands

ref: http://clang.llvm.org/docs/ThreadSafetyAnalysis.html
Bug: 124061013
Test: n/a static analysis

Change-Id: Ide594386d1e1bf3857be418b3f305c68bebd520e
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index e639b4d..495237b 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -234,6 +234,7 @@
     }
 
     auto handleTransactionLocked(uint32_t transactionFlags) {
+        Mutex::Autolock _l(mFlinger->mStateLock);
         return mFlinger->handleTransactionLocked(transactionFlags);
     }