Remove the HTMLTable{Header,Data}CellElement interfaces
Fixes#17222.
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This removes the `HTMLTableHeaderCellElement` and `HTMLTableDataCellElement` interfaces and uses the `HTMLTableCellElement` interface for both `th` and `td` elements, as per the spec.
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Add <audio> and <video> player backends
These patches enables audio and video playing inside Servo.
It is bit hackish way to enable it, thus the purpose of this pull request is for an early request for comments.
It is tested with the current servo-media GStreamer backend in Linux.
~~The produced layout is not correct, since the elements after the video seems to be stacked behind, and the same with the scrolling bars.~~
~~There is no JavaScript interface yet~~, neither controls.
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- [X] These changes fix#6711
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Add framebuffer check for mark_as_dirty, #21691
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Check `bound_framebuffer` in each `mark_as_dirty` call, so that we don't dirty the canvas if we don't have a bound framebuffer.
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Since media processing is highly asynchronous, there is no need to
match one event with the other. Then error handling is done when
the player emits the EOS event.
The have_metadata attribute is not required anymore.
This will allow the HTMLMediaElement later to get a handle to the
RenderApi for rendering video frames.
At a later time, all media handling should be moved to its own
thread/process that is communicated with via IPC. At that point this
can be removed again.
Original-patch-by: Sebastian Dröge <sebastian@centricular.com>
