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Previously cast_runner_integration_tests were creating CastRunner
instance in-process instead of launching it in a separate component.
As result the tests were not executing all parts of CastRunner.
Particularly code in main.cc was not tested. Updated the tests to start
cast_runner component in a separate process.
Also updated cast_runner to allow enabling headless mode with the
--headless argument.

Bug: 1062351
Change-Id: Id5ea70616e069aa8416855eab613ab791283668b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2113513
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812347}