Bug 864605 - Take the input chunk's volume into account in the nodes that buffer their input; r=padenot

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extra : rebase_source : 7590e20cbb1ac347f3988aaa5dbc586012747221
Bug 864606 - Take the gain node's input chunk volume into account when we have automation events for changing the gain value; r=padenot

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extra : rebase_source : 0d8c538a22ba764559a30c09e436eaaf38ac63fd
Bug 864609 - Take the panner node's input chunk volume into account; r=padenot

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extra : rebase_source : 4ccebeb02cd8a52721b5bff5f5c77f9a7201312b