Chrome Version: 69.0.3497.95 (Official Build) (64-bit)
OS: CrOS x86_64 10895.56.0

Details:
Google Chrome	69.0.3497.95 (Official Build) (64-bit)
Revision	e3a5f87b64d44c4b311d2458f16b9f469e2597fb-refs/branch-heads/3497@{#931}
Platform	10895.56.0 (Official Build) stable-channel link
Firmware Version	Google_Link.2695.1.169
JavaScript	V8 6.9.427.22
Flash	31.0.0.113 /run/imageloader/PepperFlashPlayer/libpepflashplayer.so
User Agent	Mozilla/5.0 (X11; CrOS x86_64 10895.56.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.95 Safari/537.36


What steps will reproduce the problem?
(1) On Chromebook (see the version above), Enable Hangul IME (Korean IME)
(2) login to facebook.com
(3) try to enter new post with Hangul IME, for instance, typing 한글 아무거나 입력해보세요.
(4) Some characters are missed unexpectedly and shown like this: 한르 아거 입겨보요.

What is the expected result?
한글 아무거나 입력해보세요. should be typed properly.

What happens instead?
한르 아거 입겨보요. (Some characters are missed in the middle unexpectedly)

Please use labels and text to provide additional information.

If this is a regression (i.e., worked before), please consider using the
bisect tool (https://www.chromium.org/developers/bisect-builds-py) to help
us identify the root cause and more rapidly triage the issue.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.