Changes in 20200216093058

Built from fb59957df14467695b956a7614faa7720c36b4cf

..index..
Bug 1615832 R[Core:CSS Parsing and Computation]Crash in [@ mozilla::css::StreamLoader::~StreamLoader]
Bug 1615489 R[Core:CSS Parsing and Computation]Refactor GenericGradient for conic-gradient support
Bug 1615851 R[Core:Canvas: WebGL]Crash in ImageBitmap::ToCloneData when running webgl/sdk/tests/conformance2/textures/image_bitmap_from_video/tex-2d-r32f-red-float.html?webglVersion=2&quiet=0&quick=1
Bug 1615751 R[Core:Canvas: WebGL]Prune unused parts of GLScreenBuffer
Bug 1615750 R[Core:Canvas: WebGL]On Present, invalidateFramebuffer with DEPTH_STENCIL too, not just COLOR0
Bug 1588688 A[Core:DOM: Editor]Change using array of nsINode to array of nsIContent in editor
Bug 1601585 R[Core:DOM: Editor]Intermittent editor/libeditor/tests/test_bug622371.html | The start offset of the selection shouldn't change - got +0, expected 1
Bug 1604593 R[Core:JavaScript Engine]Intermittent [tier2] GECKO(1115) | Assertion failure: IsWindowProxy(obj), at /builds/worker/workspace/build/src/js/src/vm/Compartment.cpp:247
Bug 1615609 R[Core:Layout]Rename nsRefreshDriver::IntersectionObservationAdded.
Bug 1612649 R[Core:Layout: Images, Video, and HTML Frames]Consider generating nsImageFrame for lazy-load image elements in the first place
Bug 1615445 R[Core:WebRTC: Networking]Set minimum DTLS version to 1.2
Bug 1613733 R[Core:XPCOM]Set toolkit.shutdown.fastShutdownStage to 1 (ShutdownPostLastCycleCollection) on Nightly
Bug 1615245 R[Firefox Build System:Source Code Analysis]"fopen-usage" checker should ignore gtest include files
Bug 1610374 R[Remote Protocol:Agent]Intermittent remote/test/browser/page/browser_navigateToHistoryEntry.js | Got expected current index - Got 2, expected 1
Bug 1610899 R[Toolkit:Video/Audio Controls]Closed captions list is cut off if there are many tracks
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Changes to 15 bugs - 14 fixed.