Roll engine 2586e94..914551b (11 commits)

flutter/engine@2586e94...914551b

git log 2586e94..914551b --no-merges --oneline
914551b Dart SDK roll for 2018-10-24
9f2e2ba Add/expose API for Paragraph.getBoxesForRange BoxHeightStyle and BoxWidthStyle. (flutter/engine#6644)
9669b70 Add an iOS PlatformViewsController for creating/disposing UIViews. (flutter/engine#6569)
6c2477b fix setter for viewOpaque (flutter/engine#6653)
2bd8c94 Roll src/third_party/skia a7682c8c73e4..4f598e8c829a (8 commits) (flutter/engine#6654)
e1e6093 Realize kernel asset mappings on a worker thread if one is available. (flutter/engine#6648)
d3874a9 Roll src/third_party/skia 3b57279fd65a..a7682c8c73e4 (9 commits) (flutter/engine#6652)
3dddf4d Roll src/third_party/skia 8429c7930291..3b57279fd65a (2 commits) (flutter/engine#6650)
7b3bb62 Roll src/third_party/skia 3aca39df7b22..8429c7930291 (5 commits) (flutter/engine#6647)
26e8840 Dart SDK roll for 2018-10-23
9829c51 Roll src/third_party/skia b46c4d0925ad..3aca39df7b22 (12 commits) (flutter/engine#6643)

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Author: engine-flutter-autoroll

bin/internal/engine.version

@@ -1 +1 @@
-2586e941225726f0429b9e67f4d9b6ab404d7b1e
+914551bfa46c6938843eca24038f5d6927fbfec8