Bug 1599026, part 2 - Don't send media notifications to discarded top BCs. r=alwu This patch centralizes the checking for discarded browsing contexts for the media IPC messages. It also adds a check that the top BC is not discarded, which seems to be causing crashes. A BC can be non-discard when its parent is discarded because discarding is not atomic. This changes the BC we log the id of, but hopefully that is okay. The patch also fixes the 'Browing' typo in the method name.

Bug 1599026, part 1 - De-static methods in MediaControlUtils.h. r=alwu I expect that the intention is to indicate that these are helper methods and to produce a warning if the helper methods are no longer used, but making functions static in a header creates a new copy of the function in every compilation unit that includes it.

Bug 1599180 - Fix some trivial "browing" typos. r=ehsan Differential Revision: https://phabricator.services.mozilla.com/D54570

Bug 1599175, part 2 - Remove DOS line endings in PiP's browser.ini. r=mconley Differential Revision: https://phabricator.services.mozilla.com/D54566

Bug 1599175, part 1 - Remove unused 'browingContextId' message field in PictureInPictureChild. r=mconley This field is misspelled. Don't worry though, it is also unused. Differential Revision: https://phabricator.services.mozilla.com/D54565

Bug 1598787 - Rename XRE_ChildProcessTypeToString to XRE_GeckoProcessTypeToString. r=froydnj This function works on all GeckoProcessTypes, not just those for child processes. Differential Revision: https://phabricator.services.mozilla.com/D54375

Bug 1598173 - Make NoteIntentionalCrash() work in the main process. r=froydnj For processes besides the main process, the leak log is derived from the value of XPCOM_MEM_BLOAT_LOG, but for the main process, it is simply whatever XPCOM_MEM_BLOAT_LOG is. This patch adds code to handle the latter case. It would be nice to share this code with nsTraceRefcnt.cpp, but NoteIntentionalCrash() is used in the test plugins so I don't think it can actually call into libxul. The logic isn't all that complex. Differential Revision: https://phabricator.services.mozilla.com/D54374

Revert "trying and failing to make a crashing readable streams test" This reverts commit 7664a294a0761c323bedec77917fb027d821de89.

trying and failing to make a crashing readable streams test

Bug 1598075 - Reuse Fission content processes in reader mode tests. r=Gijs There are frequent shutdown hangs in this directory. Making us reuse content processes when Fission is enabled has papered over the shutdown hangs from reader mode tests in other directories, so hopefully it will help here, too. Differential Revision: https://phabricator.services.mozilla.com/D54012

Bug 1597036 - Add fission.autostart as an optional locked pref in the troubleshooting schema. I think that Bug 1572925 made it an error to have any locked prefs reported in about:support, because they had a pref that accidentally was getting reported, and I guess we don't have any by default. fission.autostart is locked on beta and release, but not on Nightly. This patch makes it so it is okay, but not necessary, to have fission.autostart reported as a locked preference, so that the test will pass in either configuration. Differential Revision: https://phabricator.services.mozilla.com/D53888

Bug 1597804 - Fix "pricnipal" typos in some comments. r=ehsan Differential Revision: https://phabricator.services.mozilla.com/D53882

Bug 1596254 - process selectors should deal with null processes. r=mconley If a process is in the middle of shutting down, it will show up as null in the processes array. Differential Revision: https://phabricator.services.mozilla.com/D53839

Bug 1596609 - Make more tests reuse Fission content processes. r=kmag These tests are frequently leaking a single BackstagePass and its XPCWN. To paper over the leak, this patch makes us reuse Fission content processes in a few places. I filed bug 1596611 about fixing the leak and reverting the change. Differential Revision: https://phabricator.services.mozilla.com/D53108

Revert "Shutdown DMD scan" This reverts commit ca8f5d90c3d44715a29fdb6c376d8c2161cfb8dd.

Shutdown DMD scan

Fuzzy query=mochitest-media Pushed via `mach try fuzzy`

Bug 1581074 - Remove mStartBlocking; r=pehrsons

Bug 1581074 - Remove AdvanceTimeVaryingValuesToCurrentTime; r=pehrsons

Bug 1581074 - Remove flags from ProcessInput; r=pehrsons