Add support for 'Default' media session types

[Matt Rajca]

Media elements that do not specify a media session content kind should be assigned the top-level browsing context's media session.

[Radar WebKit Bug Importer]

<rdar://problem/21569054>

[Matt Rajca]

Created attachment 255676 [details]
Patch

[Darin Adler]

Comment on attachment 255676 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=255676&action=review

> Source/WebCore/Modules/mediasession/MediaSession.cpp:62
> +    , m_kind(MediaSession::Kind::Default)

Here in the MediaSession class, the name of this type is Kind, not MediaSession::Kind, so can leave off the MediaSession part.

Seems that m_kind could default to this in the header, then we could omit it in this constructor. Syntax we would normally use in the class definition is:

    Kind m_kind { Kind::Default };

> Source/WebCore/Modules/mediasession/MediaSession.h:53
> +    MediaSession(Document&);

Probably should be:

    explicit MediaSession(Document&);

[Matt Rajca]

(In reply to comment #3)
> Comment on attachment 255676 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=255676&action=review
> 
> > Source/WebCore/Modules/mediasession/MediaSession.cpp:62
> > +    , m_kind(MediaSession::Kind::Default)
> 
> Here in the MediaSession class, the name of this type is Kind, not
> MediaSession::Kind, so can leave off the MediaSession part.
> 
> Seems that m_kind could default to this in the header, then we could omit it
> in this constructor. Syntax we would normally use in the class definition is:
> 
>     Kind m_kind { Kind::Default };

That's simpler. Changed.

> 
> > Source/WebCore/Modules/mediasession/MediaSession.h:53
> > +    MediaSession(Document&);
> 
> Probably should be:
> 
>     explicit MediaSession(Document&);

Yup, looks like we use `explicit` heavily throughout WebKit to avoid implicit conversions with single-argument constructors.

Thanks!

[Matt Rajca]

Committed r186064: <http://trac.webkit.org/changeset/186064>