Merge remote-tracking branch 'origin/master' into merge-to-aosp Merged the following commits: - e61717c Fix the virtual lock device - f1fa93d Add fd event support to EventTaskRunner - 5ca27be Removing trailing whitespace from speaker.cc - b51b475 Adding handler for speaker device. - fdf7515 examples: fix prerequisites for debian - 82f215e Fixed check for pending tasks - a627e12 Run CURL in background thread.