Merge pull request #15633 from MBRSL/bug-962487-UI

Bug 962487 - [UITest][UI] refactor tests using Building Blocks, r=gasolin
Bug 959996 - JavaScript Error: TypeError: thumbnailList is undefined
Bug 961746 - Passing the correct parameter to showIfLocked
Merge pull request #15469 from lissyx/bug879192

Bug 879192 - Inhibit update-checker service during Gaia UI Tests r=fabrice,mdas
Bug 962976 - Use a blacklist to avoid compressing specific file types which are already compressed r=yurenju
Merge pull request #15196 from viorelaioia/bug_957990

Bug 957990 - Reduce length of subject and body for test_send_xxx_email t...
Bug 956787 - Merge the email tests where we can
Bug 962547 - Prevent reflows at the beginning of an edge gesture.
r=vingtetun
Bug 835307 - Polish l10n properties of Cost Control
Bug 951681 - Single variant build process uses invalid init.json
Bug 945095 - Use same format to set reporter between test-agent & test-integration. r=julienw
Bug 958939 - [OTA][Helix] The items added in home screen are missing when device updates from v1.2 to v1.3
Merge pull request #15629 from askeing/962937

Bug 962937 - Unxfail test_sms_with_attachments.py
Merge pull request #15606 from etiennesegonzac/bug-962547-edge-panning-reflows

Bug 962547 - Prevent reflows at the beginning of an edge gesture. r=vingtetun
Merge pull request #15621 from dwilsoncaf/bug-960756-master

Bug 960756 - Add CONFIG_MAX_SNAPSHOT_PIXEL_SIZE. r=djf
Merge pull request #15600 from Pike/bug-962535-build-downloads-private

bug 962535, make downloads of the build system private
Merge pull request #15116 from viorelaioia/bug_956787

Bug 956787 - Merge the email tests where we can
Bug 907112 - Prevent the phone from unlocking in my pants
* Reset the slide detection if a new touch point appears
* Better state cleanup
Merge pull request #15640 from fabricedesre/no-compress

Bug 962976 - Use a blacklist to avoid compressing specific file types wh...
Bug 950622 - [Download Manager] The % of the download is not displayed in a notification for files with long names