Roll engine e5ec3cf3ea5c..b7f6bf0192d1 (28 commits) (#26430)

(cloned from https://github.com/flutter/flutter/pull/26399)

https://github.com/flutter/engine/compare/e5ec3cf3ea5c...b7f6bf0192d1

git log e5ec3cf3ea5ce78c6c3116271601f60d30a799d4..b7f6bf0192d175ac2c245f27524c5195140ecd50 --no-merges --oneline
b7f6bf019 Pass deadline to embedder idle notification callback (flutter/engine#7444)
5272805f1 Fix settings.advisory_script_uri in iOS createShell (flutter/engine#7235)
788dea5dd Eliminate std::string using directive (flutter/engine#7433)
cd98f6bdb Clear the font collection's cache when a font is dynamically loaded (flutter/engine#7436)
dea6a0849 Remove legacy and deprecated defaultClipBehavior (flutter/engine#7439)
5749b75af Temporary revert of Dart SDK rolls made since 2019/01/08 (flutter/engine#7437)
29c70f5fc Roll src/third_party/skia 292ece8024ea..d2fa7e33798c (8 commits) (flutter/engine#7434)
37d886ef8 Simplify rollback of dynamic patches (flutter/engine#7432)
6071286ef Download dynamic patch to separate file, then rename it to install. (flutter/engine#7428)
4c9136bdb Roll src/third_party/dart cb966bdce7a0a9d0c34149b50ae5704676cf34c8..651d19cdaa25d020b8f7c193c907644284029130 (4 commits) 651d19cdaa Ignore --fast-startup flag, assume true aeb7fccd5b Fix plugin start up to work with OverlayResourceProvider 0b0704c7c4 [vm] Use std::abs instead of regular abs(). 36b5fe0c7a Track how many analysis server requests had latency info
239f16e72 Roll src/third_party/dart 927b0cb9edda5500fed0acbd60c04487d3e526e6..cb966bdce7a0a9d0c34149b50ae5704676cf34c8 (1 commits) cb966bdce7 Unify parsing of co19 test options and regular test options.
2501eb42e Roll src/third_party/dart f4986cc78ddd884e60e7274c44f31dbcd990b912..927b0cb9edda5500fed0acbd60c04487d3e526e6 (73 commits)927b0cb9ed [vm/aot] Support optimization of modulo against a power-of-two. bf13ac85c4 Ensure LSP server clears diagnostics for removed files/analysis roots 54fffe4cca Add support for LSP workspace/didChangeWorkspaceFolders e7b783ba5d Fix bug with deprecated rootPath + add tests ad300b904d Improve handling of server-specific analysis diagnostics pages 1d096d8499 Enable the analyzer Diagnostics server for LSP 6bb1dcdfa4 Fix wording e749576caa [VM/Compiler/AOT] Do not populate unused arguments descriptor in bare instructions mode a1250467fe Move member conflict detection to own method
39a99b005 Docs improvements per @Hixie's comments (flutter/engine#7387)
26e02aaa2 Wire up support for external OpenGL textures for the embedder. (flutter/engine#7087)
20d70d2bf Eliminate unused import of ZipException (flutter/engine#7429)
b972f75db Allow embedders to add per shell idle notification callbacks. (flutter/engine#7427)
844d27cb3 Refactor dynamic patching to use clearer naming and structure. (flutter/engine#7426)
99fa3901a Roll src/third_party/skia 3560ea702f1b..292ece8024ea (9 commits) (flutter/engine#7424)
97ff4b226 Dart SDK roll for 2019-01-09
39b2e4b02 Roll src/third_party/skia 76dc683364c2..3560ea702f1b (10 commits) (flutter/engine#7420)
88e212f99 Dart SDK roll for 2019-01-09
82d3208d4 Roll src/third_party/skia 1337f5b85978..76dc683364c2 (18 commits) (flutter/engine#7418)
8657340c8 Dart SDK roll for 2019-01-09
a369ef606 Dart SDK roll for 2019-01-08
3ae5eb8c1 Dart SDK roll for 2019-01-08
42f449fa4 remove deprecated updateNode argument (flutter/engine#7413)
5e33f33a1 Refactor shared code into separate function to simplify further work. (flutter/engine#7410)
937ee8bf9 Cleanup dead code (flutter/engine#7409)

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Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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bin/internal/engine.version

-e5ec3cf3ea5ce78c6c3116271601f60d30a799d4
+b7f6bf0192d175ac2c245f27524c5195140ecd50