It supports alternative names for Chrome such as chromium, as well as
extra names to look for like headless-shell.
Also swap the os.Getenv logic, so that we only do the exec.LookPath work
if the env var is unset.
tip is rather unstable, so we shouldn't block PRs if it happens to break
our build or tests.
While at it, run 'go mod tidy' with the latest tip version.
Before the fix, the added test would give a Pool.Allocate error like:
pool could not connect to 9000: timeout waiting for initial target
The actual underlying error, which can only be seen if one inspects
chrome's stderr, is that it failed to bind to the debugging protocol
port if it was already in use.
This is of course an issue with the environment that chromedp is being
run under, since it was given a port range that wasn't available.
However, the confusing error can lead to developers wasting their time
instead of spotting the error quickly.
Unfortunately, there doesn't seem to be a way to have Chrome exit
immediately if it can't bind to the given port. So, instead of relying
on it, check if the current process can bind to the port first.
Add a test too, where we grab the first port in the pool range, and
check that we get an error that's not confusing.
Fixes#253.
There's no need to put the error variables in a larger scope, nor define
them earlier than necessary. If anything, it makes the code harder to
follow, such as figuring out when nil errors are returned.
1. Changes travis configuration to use the chrome addon
2. Adds more command line options to runner package
3. Removes grab-headless_shell.sh script
4. Cleans up and adds some environment variables for controlling how
unit tests are ran
5. Fixes a minor issue in chromedp-gen on comment output (for working
with latest protocol definition)
