Cherry pick PR #3364: Webdriver: fix window ID parsing #306

Job	Run time
raspi-2 / initialize	41s
raspi-2-skia / initialize	42s
raspi-2 / docker-build-image	1m 31s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	1m 23s
raspi-2-skia / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	9m 6s
raspi-2-skia / raspi-2-skia_debug	13m 52s
raspi-2-skia / raspi-2-skia_qa	7m 48s
raspi-2-skia / raspi-2-skia_gold	7m 25s
raspi-2 / raspi_devel	9m 49s
raspi-2 / raspi_debug	12m 29s
raspi-2 / raspi_qa	8m 7s
raspi-2 / raspi_gold	7m 28s
raspi-2 / sbversion-15_devel	8m 57s
raspi-2 / sbversion-15_debug	12m 52s
raspi-2 / sbversion-15_qa	7m 56s
raspi-2 / sbversion-15_gold	7m 34s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	1h 57m 40s

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