Roll engine e54bc4e..4bef15c (16 commits)

flutter/engine@e54bc4e...4bef15c

git log e54bc4e..4bef15c --date=short --no-merges --format='%%ad %%ae %%s'
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)

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bin/internal/engine.version

@@ -1 +1 @@
-e54bc4ea1832352c4c92f54ed6919ac5bff154ab
+4bef15c41ba9a8d79d6689bfb17b77187c7d7f97