* Update compiler to v20150609.
* Since v20150315:
* Promise.prototype.catch externs now provided by compiler.
* Iterator externs now provided by compiler.
* Variadic function syntax has changed.
* Since v20150505:
* BufferSource extern now provided by compiler.
* Since v20150609:
* VideoPlaybackQuality extern now provided by compiler.
b/21559591
Change-Id: Ie7d030422e132879e28b1bdf538991a27ebc25df
Use Stream.BUFFER_SIZE_SECONDS_ on startup.
Improved the way adaptation latency is measured.
Avoid calling abort() twice during adaptation.
Reduce the size of the Promise chain slightly.
Merge the SPLICING state into SWITCHING.
Change-Id: Ie06e6c56df4df17e7acb379d0e19f639f791c99b