Bug 894744 - Use localStorage event to make inter-page communication between music app and music activity
Merge pull request #14607 from dwi2/bug894744_v1.2f

Bug 894744 - Use localStorage event to make inter-page communi...
Bug 949905 - wait until transition end to show keyboard

also prevent users from interrupting the transition of panels.
Merge pull request #14946 from evelynhung/issue-949905-v1.2f

Bug 949905 - wait until transition end to show keyboard, r=evelyn