tree aef9f3291202d8a5707ee9b6fbe951b915ee5c04
parent 10627ba484528fed3e7358b1801250bb004c8a99
author cdumez@apple.com <cdumez@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570658609 +0000
committer cdumez@apple.com <cdumez@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570658609 +0000

Youtube.com is unable to enter the back/forward cache on macOS
https://bugs.webkit.org/show_bug.cgi?id=202754
<rdar://problem/56117666>

Reviewed by Eric Carlson.

Source/WebCore:

As of r250542, the MainThreadGenericEventQueue used by both MediaSource and
SourceBuffer to fire event is PageCache-aware. As a result, both these
ActiveDOMObjects can now safety suspend without risking running script while
in the page cache. I did have to update some logic in MediaSource::removeSourceBuffer()
to make sure we do not unnecessarily construct new ActiveDOMObjects while
suspending, as this is not allowed.

Test: media/media-source/media-source-page-cache.html

* Modules/mediasource/MediaSource.cpp:
(WebCore::MediaSource::removeSourceBuffer):
(WebCore::MediaSource::canSuspendForDocumentSuspension const):
* Modules/mediasource/SourceBuffer.cpp:
(WebCore::SourceBuffer::canSuspendForDocumentSuspension const):
* Modules/mediasource/SourceBuffer.h:

LayoutTests:

Add layout test coverage.

* media/media-source/media-source-page-cache-expected.txt: Added.
* media/media-source/media-source-page-cache.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@250935 268f45cc-cd09-0410-ab3c-d52691b4dbfc