Add additional debug logging in LayoutAnimationDriver

Summary:
Log final when synthetic final mutations are generated at the end of an animation.

Changelog: [Internal]

Reviewed By: sammy-SC

Differential Revision: D27407768

fbshipit-source-id: 0e9aface54bcca73dfa5ea263a8474db7c47c078

ReactCommon/react/renderer/animations/LayoutAnimationDriver.cpp

@@ -146,6 +146,9 @@ void LayoutAnimationDriver::animationMutationsForFrame(
               keyframe.viewPrev,
               keyframe.viewEnd,
               -1};
+          PrintMutationInstruction(
+              "Animation Complete: Queuing up Final Synthetic Mutation:",
+              mutation);
           react_native_assert(mutation.oldChildShadowView.tag > 0);
           react_native_assert(mutation.newChildShadowView.tag > 0);
           mutationsList.push_back(mutation);