Add `cdp.browser_control`: high-level browser automation API #380

Job	Run time
test-review-and-execution (chromium, headed)	41s
test-review-and-execution (firefox, headless)	38s
test-review-and-execution (chromium, headless)	48s
test-review-and-execution (webkit, headless)	1m 4s
test-review-and-execution (firefox, headed)	46s
test-review-and-execution (webkit, headed)	52s
test-coverage-review	6s
	4m 55s

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