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

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

--HG--
extra : rebase_source : 4ccebeb02cd8a52721b5bff5f5c77f9a7201312b
Bug 838321: Use b2g manifests for panda/unagi builds. r=rail

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extra : rebase_source : 8b1b1275fbb23e15b77c811d7d0bbd6605ddd9dc
Bug 862054 - Move translateToTopLevelWindow to Util. r=bbondy
Bug 862054 - Get rid of ElementTouchHelper and our custom elementFromPoint function. r=mbrubeck
Bug 862054 - Update bounds utility methods in SelectionHandler to properly calculate offsets for form inputs in sub frames. r=bbondy
Bug 864533 - test helper addTab should use pageShowPromise. r=sfoster
Bug 863739 - Add text input selection related mochitests. r=rsilveira
Bug 864428 - Don't call hideContextUI in startup and tear down test helpers as it can cause random test timeouts. r=bbondy