Integrate base/ platform from VS Code and adopt scroll bar #807

Job	Run time
lint	1m 4s
build	1m 3s
test-integration (18, ubuntu, chromium)	3m 32s
test-integration (18, ubuntu, firefox)	3m 50s
test-unit (18, ubuntu)	1m 19s
test-integration (18, ubuntu, webkit)	2m 57s
test-unit (18, macos)	1m 23s
test-unit (18, windows)	9m 43s
test-unit-coverage	53s
release-dry-run (18)	2m 1s
	27m 45s

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