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Adds the Chromium extensiuon system to Qt WebEngine.
Currently, it only exposes internal APIs to the internal
PDF viewer extension.
To load a PDF, simply navigate to it.
This feature can be configured via the webengine-extensions flag
and is turned on by default.
Needs patch in Chromium 71-based to build.
Adaptations to 71-based from 69-based include:
* Flag out update installation, add crx file dependency
* Move PostTask over to 71-based implementation
* Move extensions API providers to 71-based implementaion
* Don't use custom guest view and mime handler view delegates
* Adapt the URLRequestResourceBundleJob to match new interface
* Move extension system initialization to end of profile constructor
Change-Id: I4fa5149057291bb5847f048534c11820cd7ff58c
Fixes: QTBUG-50556
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
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