Feat: add Event.preventDefault() support. #2175

Job	Run time
setup	12s
bridge_unit_test	10m 22s
build_bridge	8m 0s
webf_unit_test	55s
preload_page_test	2m 26s
integration_test (BOM)	1m 59s
memory_leak_test	3m 0s
multiple_page_test	2m 21s
integration_test (CSSOM)	1m 47s
prerendering_page_test	2m 44s
integration_test (Storage)	1m 14s
integration_test (DOM)	2m 32s
integration_test (BoxModelAndSizing)	3m 19s
integration_test (BackgroundsAndBordersAndOverflow)	2m 30s
integration_test (FlexBoxLayoutAndPositionedLayout)	7m 34s
integration_test (FontsAndImages)	2m 5s
integration_test (TextAndColorAndFilterEffect)	1m 41s
integration_test (Transforms)	1m 17s
integration_test (Transitions)	2m 56s
integration_test (Animations)	2m 31s
integration_test (ValuesAndUnitAndVaraiables)	1m 27s
integration_test (Selectors)	1m 21s
integration_test (SVG)	1m 59s
	1h 6m 12s

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