We should flag animations on non-composited properties in devtools.

The required information to do this is already in tracing, added here:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/inspector/InspectorTraceEvents.cpp?rcl=c5b0d3fffea7f2b8a54718903d82f221ca204d85&l=1172

One of the most common anti-patterns we see in websites that feel janky is CSS animations or transitions on slow properties.