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The script now assumes GN adds coverage flags to the cflags for each
source file. The script removes the flag if the file is in an exclusion
list, or if `--files-to-instrument` is set it will also remove flags if
the file is not listed in that argument.

The script supports multiple exclusion lists that can be selected with
the `--target-os` flag.

It's expected that GN will set these flags correctly and invoke the
script in all coverage builds. http://crrev.com/c/1496002 does that.


Bug: 918215
Change-Id: I4454f67067a083581f31a22cfef85368825789f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1495994
Commit-Queue: Sajjad Mirza <sajjadm@google.com>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Roberto Carrillo <robertocn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637892}