[GStreamer] Do not use the registry scanner singleton from the UI process

[Carlos Garcia Campos]

The registry scanner is used from the UI process only to initialize the MIME type registry, so it's called once and the results are cached forever. Using the singleton keeps the instance alive forever, so we can just create a temporary registry to get the supported types.

[Carlos Garcia Campos]

Created attachment 417173 [details]
Patch

[Víctor M. Jáquez L.]

Comment on attachment 417173 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=417173&action=review

> Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.h:44
> +    ~GStreamerRegistryScanner() = default;

I wonder if it 's worth to have a 

if (!isInWebProcess())
    gst_deinit()

In the destructor

[Carlos Garcia Campos]

(In reply to Víctor M. Jáquez L. from comment #2)
> Comment on attachment 417173 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=417173&action=review
> 
> > Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.h:44
> > +    ~GStreamerRegistryScanner() = default;
> 
> I wonder if it 's worth to have a 
> 
> if (!isInWebProcess())
>     gst_deinit()
> 
> In the destructor

No, init and deinit are not balanced. It's ok to call init even if the app already called it, because it does nothing, but not the other way around.

[Carlos Garcia Campos]

Committed r271353: <https://trac.webkit.org/changeset/271353>

[Radar WebKit Bug Importer]

<rdar://problem/72988084>

[Fujii Hironori]

Committed r271385: <https://trac.webkit.org/changeset/271385>

[Fujii Hironori]

Comment on attachment 417173 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=417173&action=review

> Source/WebCore/ChangeLog:11
> +        * platform/glib/RuntimeApplicationChecksGLib.cpp: Added.

I'd like to remove this file.
  Bug 220529 – Reimplement WebCore::isInWebProcess() family as cross-platform by using AuxiliaryProcessInitializationParameters.processType