In order to sort between events that have the same timestamp we use the
sort order of the corresponding animations so we need to store a pointer
to the animation along with the event.
The elapsedTime member reported on AnimationEvents measures the time from
the *end* of the delay phase (i.e. the beginning of the active interval) to
when the event occurred. However, the AnimationTimeToTimeStamp method
introduced in the previous patch expects a time relative to the animation's
start time (i.e. the *start* of the delay phase). This patch adds a method
that performs the necessary conversion from an elapsedTime to an animation
time before calling AnimationTimeToTimeStamp. It also provides extra handling
for cases such as when the animation's start time has not yet been resolved or
when animation effect has disappeared.
This patch adds a utility method to Animation which takes a time in the
same time space as "current time", i.e. "animation time" and convert it to
a TimeStamp. Subsequent patches in this series will use this method to
take the time when an event was scheduled to occur and convert it to a
TimeStamp so it can be compared with other event times. This allows us to
dispatch events in the order they would have fired given an infinitely
frequent sample rate.
This patch lines up the parameters of AnimationEventInfo and
TransitionEventInfo constructors so that they are more logical and consistent.
Specifically, it groups the element and pseudo type together since they
form a logical pair denoting the event target. For AnimationEventInfo this
patch also places the type of event before the common event parameters since
the event type seems to be more significant.
This patch also performs some miscelleaneous housekeeping: removing some
unnecessary namespace prefixes, whitespace fixes, and making
TransitionEventInfo use the same concrete type to store the target element
as AnimationEventInfo (dom::Element instead of nsIContent).
Currently we define a helper method, InitialAdvance, on KeyframeEffectReadOnly.
However, this method is only used for filling out the elapsedTime member of
AnimationEvents (which are generated by CSS animations). This patch moves this
method to CSSAnimation since it is unneeded for other types of Animations.
A MediaDataDemuxer is now not to resolve the init promise until it has all the metadata.
Except MediaSource, all demuxers would be doing blocking read to scan for the metadata, and having partial metadata would be an error.
For MediaSource, we pass the NotifyDataArrived message which will cause the MediaSourceDemuxer to re-attempt to search for the metadata.
When used within MediaSource's TrackBuffersManager, a demuxer will never be created until we have received a complete init segment (this task is performed by the various ContainerParsers)