Bug 1032757 - Re-enable Music player tests - Playback tests.
 - get progress while the music app is in background
Bug 1028085 - rewrite Makefile of camera app in javascript
addressed nit
Bug 1033183 - [Wifi] Server certificate items are duplicated when disabling and re-enabling wifi
Merge pull request #21447 from RudyLu/music/Bug1032757_reenable_player_test_commit

Bug 1032757 - Re-enable Music player tests - Playback tests.
r=jimporter.
Merge pull request #21023 from yurenju/camera-remove-makefile

Bug 1028085 - rewrite Makefile of camera app in javascript r=@cctuan
Revert "addressed nit"

This reverts commit 977fa6a83a866dd09f3c1c94718ac4c2c61d92e1.
Revert "Bug 1028085 - rewrite Makefile of camera app in javascript"

This reverts commit 437eb65867dcd85b0cd52bc9118d2502441d403a.
Bug 1028085 - rewrite Makefile of camera app in javascript r=gduan f=dmarcos
Merge pull request #21558 from yurenju/camera-remove-makefile-squash

Bug 1028085 - rewrite Makefile of camera app in javascript r=gduan f=dma...
Bug 1029967 - rewrite Makefile in email app in javascript r=gduan
Merge pull request #21013 from yurenju/email-remove-makefile

Bug 1029967 - rewrite Makefile in email app in javascript r=gduan
Merge pull request #21438 from ian-liu/settings/wifi/bug1033183_server_certificate_items_are_duplicated_when_disabling_and_reenabling_wifi

Bug 1033183 - [Wifi] Server certificate items are duplicated when disabling and re-enabling wifi, r=arthur