To be able to wrap the devtools API namespaces, this patch applies the
following changes:
- fix: Prevent Proxy violation exception on the read-only/non-configurable devtools property
by using an empty object with the `chrome` API object as its prototype
as the root Proxy target (the Proxy instances returned for the
`chrome` API object) and add a related test case.
- fix: Added support for a new `singleCallbackArg` metadata property,
which prevents devtools.panels.create to resolve an array of
parameters (See the related Chromium issue at
https://bugs.chromium.org/p/chromium/issues/detail?id=768159)
and add the related test cases.
- test: Changes to the test case related to proxy getter/setter behavior
on non wrapped properties:
in the "deletes proxy getter/setter that are not wrapped" test case from
the "test-proxied-properties.js" test file, we ensure that when a
getter/setter is called for a "non-wrapped" property, the getter/setter
is going to affect the original target object, unfortunately this in
not true anymore for the root object (the `chrome` API object) because
we are using an empty object (which has the `chrome` API object as its
prototype and it is not exposed outside of the polyfill sources)
as the target of the Proxy instance related to it,
this change to the target of the Proxy has been needed to prevent the
TypeError exception raised by the Proxy instance when we try to access
the "devtools" property (which is non-configurable and read-only on the
`chrome` API object).
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