Bug 1471866 - Ensure viewport scrollbar uses style from root element. r?spohl MozReview-Commit-ID: 1rIJFJHN0vf

Bug 1471408 - Move all top level Java classes into their own file. r=snorp MozReview-Commit-ID: 716FWeZ0q3B

Backed out changeset f02de3ec24e3 (bug 1471408) for causing Android build bustages on VirtualPresentation.java. r=backout

Bug 1471766 - Ensure scrollcorner is handled for webrender. r?jrmuizel MozReview-Commit-ID: JIIuG46WF3f

Bug 1471162 - Stop using fake floating scrollbar in OSX dark theme; MozReview-Commit-ID: 8nFpHCWojYC

Merge mozilla-inbound to mozilla-central. a=merge

Bug 1461204 - check the residual offset for following groups. r=kats This was missed when the residual offset was added; it's correctly checked elsewhere MozReview-Commit-ID: 44N5vDWLBIo

Bug 1471106 - Set overflow:hidden to body element to avoid accidentally unthrottling animations to update the overflow region. r=birtles MozReview-Commit-ID: CtcgyUq37W5

Bug 1215818 - part 3: Add telemetry probe to collect IM share on Linux r=m_kato Different from Windows and macOS, we cannot check if active keyboard layout works as "IME" actually. Therefore, this patch add the telemetry probe to the dispatcher of eCompositionStart. However, composition string is also used by some Wester keyboard layouts which have dead keys. So, the meaning of the result is deferent from the other platforms, but it must be useful information which IM (e.g., fcitx, ibus) is used by most users. MozReview-Commit-ID: A7vYuGtcrRw

Bug 1215818 - part 2: Add telemetry probe to collect IME usage on macOS r=m_kato This patch adds a telemetry probe to collect Input Source ID or Bundle ID of IME when an IME open mode is selected by user. Input Source ID includes input mode of IME, but Bundle ID does not so. In most languages, we need to collect the former, but only for Japanese IME, we need to collect the latter because non-Japanese IME's input mode is "how to input characters". So, the input mode is important. However, Japanese IME's input mode is "to input which type of characters". So, Japanese IME user may use multiple input modes but we need only the IME mode. If we'd collect number of each input mode users of Japanese language, it'd be difficult to count how many users actually used typical Japanese IME since somebody may use only a mode, some others may use only different modes. So, this patch collects Input Source ID when non-Japanese IME is open and Bundle ID when Japanese IME is open. MozReview-Commit-ID: CltLrWVGyRk

Bug 1215818 - part 1: Add telemetry probe to collect TIP names of TSF which are actually used by the users r=jimm,m_kato We always struggle with a lot of IME bugs on Windows. Currently, any IME vendors should've already released TIP for TSF rather than legacy IMM-IME since IMM-IME is not available on UWP apps. Additionally, due to API limitation, it's difficult to get human-friendly name of IMM-IME. So, let's collect only TIP names of TSF on Windows. This must be enough. Note that we cannot get common-English name even though the API to retrieve TIP name taking language code. Therefore, a TIP may be collected with different name, e.g., one is Japanese name and the other is English name. If we collect GUIDs of TIP, we can avoid this issue. However, it's difficult to collect both GUID and human-friendly name since Telemetry key is up to 72 characters. Currently, I give up to avoid this duplicated issue. Perhaps, this is not so serious issue since most TIP users must match language of TIP and their system language settings. Therefore, this patch collects Locale ID of TIP and description of it. Locale ID is necessary because some TIPs may be named same name for different languages. For example, both Japanese and Hangul IMEs of Microsoft are named as "Microsoft IME". MozReview-Commit-ID: IeSxfeqS62a

Bug 1398483 - Implement column and row gap for flexbox. r=dholbert MozReview-Commit-ID: 2EmaG3G0HRI

Bug 1469877 - XUL accessible highlighter position is incorrect at different zoom levels. r=pbro,yzen MozReview-Commit-ID: JifRFqv5oGE

Bug 1324147 - Remove MOZ_GAMEPAD_BACKEND; r=daoshengmu MOZ_WIDGET_TOOLKIT can be used for platform choice for Gamepad. Need to leave linux header check in configure for now. MozReview-Commit-ID: VT7T2KmLts

Bug 1470746 Avoid dispatching delayed webRequest events on closed channels r=kmag MozReview-Commit-ID: 1ScsJ1URWG6

Bug 1471452 - Fix a contain:paint web platform test by addressing an inconsistency between testcase & reference case. r=dholbert MozReview-Commit-ID: JTG4q8mkEt1

Bug 1355482 - documentation for partner repacks, r=aki MozReview-Commit-ID: 5uRWpw2WJyE

Bug 1438290: Part 2: Added testcases for AddDataChannel, r=bwc Added C++ unit test CheckAddDataChannel Added C++ unit test CheckAddDataChannel_Draft05 MozReview-Commit-ID: HsSdFb0nKUe

Bug 1438290: Part 1: Implemented RsdparsaSdpMediaSection::AddDataChannel, r=dminor Implemented RsdparsaSdpMediaSection::AddDataChannel Added C++/Rust glue code for the "sctp port" attribute Added C++/Rust glue code for the "max message size" attribute MozReview-Commit-ID: 5MQC7I1MiU0

Bug 1466899 - TPS now checks the name from the clients collection rather than the tabs collection. r=tcsc MozReview-Commit-ID: K9Vep0k2nRF Differential Revision: https://phabricator.services.mozilla.com/D1819