Firefox automation now uploads resource usage JSON files as
job artifacts (see bug 1272202). Now that the build system
writes the same data format and `mach resource-usage` can
read this data format, let's teach `mach resource-usage`
to load arbitrary URLs. This allows people to view system
resource usage for arbitrary jobs in automation.
Currently, you have to look at Treeherder to find the URL to
the build-resources.json artifact. Perhaps in the future
we can make finding the URL easier. Or we could integrate
source resource viewing into Treeherder itself (this is
probably preferred).
This commit continues the tradition of `mach resource-usage`
being a hacked up mess. Instead of loading the URL in
the browser, we download the URL from Python then serve it
from the HTTP server running as part of `mach resource-usage`.
This is somewhat horrible. But it was easiest to implement.
It also conveniently bypasses any cross origin request
restrictions the browser may impose. So it is useful.
MozReview-Commit-ID: IR1Cfs7SrRN
--HG--
extra : rebase_source : 91f5f807c19643ac4d1edb8f6652110813f7e53f
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d897b3b204