Without this patch, if we have an AudioBufferSourceNode which is finished, the
nodes following it will not see its mLastChunk. This breaks the Web Audio
block processing logic since we rely on the assumption that the buffer for the
last output of AudioBufferSourceNode is correctly passed to the following
engines.
Here is what this patch does:
* Got rid of the JSBindingFinalized stuff
* Made all nodes wrappercached
* Started to hold a self reference while the AudioBufferSourceNode is playing back
* Converted the input references to weak references
* Got rid of all of the SetProduceOwnOutput and UpdateOutputEnded logic
The nodes are now collected by the cycle collector which calls into
DisconnectFromGraph which drops the references to other nodes and destroys the
media stream. Note that most of the cycles that are now inherent in the
ownership model are between nodes and their AudioParams (that is, the cycles
not created by content.)
Also removes NotifyHasCurrentData's boolean parameter; we just fire this
once and treat a stream that has once had current data as always
having current data (since we block a stream that would advance
beyond its available data).
Modifies MediaStreamGraph to always advance its time by a multiple of
WEBAUDIO_BLOCK_SIZE.
--HG--
extra : rebase_source : 99524b09edd4ac0e1bc6607f2ba14925bc2f11c2
