Roll engine e54bc4e..6e780fd (29 commits)

flutter/engine@e54bc4e...6e780fd

git log e54bc4e..6e780fd --date=short --no-merges --format='%%ad %%ae %%s'
2018-08-15 1751188+NikoYuwono@users.noreply.github.com Add NSNull check in setSystemChromeSystemUIOverlayStyle (flutter/engine#6011)
2018-08-14 jamesderlin@users.noreply.github.com Don't require `FLTLibraryPath` and `FLTAssetsPath` from the main `NSBundle` (flutter/engine#5986)
2018-08-14 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia d4322a8630bc..32c7d4dfcdca (2 commits) (flutter/engine#6013)
2018-08-14 kustermann.martin@gmail.com Widen sdk version constraint of package:{flutter_services,sky_engine,sky_services} to allow ^2.0.0 (flutter/engine#6012)
2018-08-13 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 1b95ef9f9912..d4322a8630bc (1 commits) (flutter/engine#6010)
2018-08-13 jason-simmons@users.noreply.github.com Do not log unwind errors during isolate shutdown (flutter/engine#6008)
2018-08-13 chinmaygarde@gmail.com Remove unused argument on Animator, Engine and PlatformView delegates. (flutter/engine#6007)
2018-08-13 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia beac4195ccb7..1b95ef9f9912 (1 commits) (flutter/engine#6006)
2018-08-13 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia b35c655378ee..beac4195ccb7 (6 commits) (flutter/engine#6005)
2018-08-13 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 87a737292804..b35c655378ee (1 commits) (flutter/engine#6004)
2018-08-13 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia f1a25c06cd15..87a737292804 (1 commits) (flutter/engine#6003)
2018-08-12 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 02d174687cc9..f1a25c06cd15 (1 commits) (flutter/engine#6002)
2018-08-11 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 5fb1b7e0ffe1..02d174687cc9 (1 commits) (flutter/engine#6001)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 609fbe34de01..5fb1b7e0ffe1 (3 commits) (flutter/engine#6000)
2018-08-10 stanislav@gmail.com Make 'gn --debug' and 'gn --debug --dynamic' identical. (flutter/engine#5999)
2018-08-10 jbauman@google.com Enable VK_KHR_get_physical_device_properties2 (flutter/engine#5982)
2018-08-10 jbauman@google.com Add VK_ERROR_FRAGMENTATION_EXT (flutter/engine#5981)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia a9660ec89bc7..609fbe34de01 (7 commits) (flutter/engine#5998)
2018-08-10 chinmaygarde@gmail.com Check the kernel header magic to determine if a mapping may be a valid kernel blob. (flutter/engine#5997)
2018-08-10 nathanrogers@google.com Add a delay to Animator::BeginFrame's NotifyIdle call (flutter/engine#5972)
2018-08-10 stanislav@gmail.com Fix codepush breakage caused by flutter#5954. (flutter/engine#5996)
2018-08-10 amirh@users.noreply.github.com Cast MotionEvent timestamps to Number. (flutter/engine#5994)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 6ed63968a391..a9660ec89bc7 (14 commits) (flutter/engine#5993)
2018-08-10 tvolkert@users.noreply.github.com Reference platform_strong.dill, not platform.dill (flutter/engine#5992)
2018-08-10 jason-simmons@users.noreply.github.com Update to FreeType 2.9.1 (flutter/engine#5991)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 5b5d84cc1f37..6ed63968a391 (4 commits) (flutter/engine#5989)
2018-08-10 37626415+skia-flutter-autoroll@users.noreply.github.com Roll src/third_party/skia 0d5d0659a684..5b5d84cc1f37 (39 commits) (flutter/engine#5988)
2018-08-10 kustermann.martin@gmail.com Roll Dart to version be6309690fd60284a87f3258a740c7c30efb1092 (flutter/engine#5987)
2018-08-09 a-siva@users.noreply.github.com Roll Dart to version 1be785ae2ddb1754a184cd638ab719e94d86b4e9 (flutter/engine#5985)

The AutoRoll server is located here: https://flutter-engine-flutter-roll.skia.org

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

bin/internal/engine.version

@@ -1 +1 @@
-e54bc4ea1832352c4c92f54ed6919ac5bff154ab
+6e780fdc672e59fc7bc84d5b7963b1fb9cc68830