@jaebaek -- Could you please provide us few more steps to reproduce the issue which would help us to triage the issue further.
Thanks in Advance.

jaebaek, can you attach the apk you used to test

You can use WebView that loads http://output.jsbin.com/murusuj and has wrap_content as its layout_width and layout_height.

The attachment is the apk I tested on Android N and M.

1. After opening the app, attach any string (e.g., HelloWorld, Test, and so on) to the input form.
2. Press 'enter' button in your keyboard. (it may move to full screen webview page)
3. Kill the app and open it again.
4. If you press the input form, it will show autofill popup.

Deleted: app-debug.apk 465 KB

app-debug.apk 465 KB Download

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@jaebaek -- Thank You for the update.

From Comment# 3, tried installing the provided apk on Samsung SM-J710F (Android 7.0.0) and Pixel XL (Android 8.1.0) and was unable to launch the attached apk.

When trying to launch the apk the following error "My application has stopped" is being displayed.

Could you please provide us more information or screen cast which would help us in triaging the issue further.
Thanks in Advance.

Hmm.. Please try the following app again.

Deleted: app-debug.apk 1.5 MB

app-debug.apk 1.5 MB Download

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@jaebaek -- Thank You for the new apk. Below are the steps followed.

(i) Installed the app and launched it.
(ii) Entered the text "Hello World" and clicked on Enter from Keyboard.
(iii) Device requested to open it in Chrome or Chrome Canary.
(iv) Clicked on Chrome and exited the apk installed.
(v) Clicked on the text input in Chrome and observed the autofill suggestion is properly placed.
(vi) Relaunched the apk installed and clicked on the text input but no autofill suggestions were seen.

Please let me know if i have missed anything.
Thanks in Advance.

(vi) Relaunched the apk installed and clicked on the text input but no autofill suggestions were seen.

Here click the text input one more ..

See the attached video.

Deleted: webview_bug.mp4 14.2 MB

	webview_bug.mp4 14.2 MB View Download

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This is WebView autofill complete issue since the Android platform is pre-O.

I just checked this bug happens in Android platform 6.0.1.
(tested it in master branch after gclient sync)

Please check it again.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2b5e77d0eadf50c634b4084f9a248c78402e7458

commit 2b5e77d0eadf50c634b4084f9a248c78402e7458
Author: Jaebaek Seo <jaebaek@chromium.org>
Date: Tue Dec 12 00:31:19 2017

Relocate select popup of Android WebView

As shown in  crbug.com/786852 /#c9, the current select popup in Android WebView
is not correctly located. The main reason is that the left margin for the anchor
rectangle of the popup is added by x value of scroll manager. This CL adds y
value of scroll manager to the left margin instead.

Bug:  786852 
Change-Id: I8ebf983de64eea3c89d8fc7d2063962a7f1c7bb1
Reviewed-on: https://chromium-review.googlesource.com/818679
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Commit-Queue: Jaebaek Seo <jaebaek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523268}
[modify] https://crrev.com/2b5e77d0eadf50c634b4084f9a248c78402e7458/android_webview/java/src/org/chromium/android_webview/AwScrollOffsetManager.java
[modify] https://crrev.com/2b5e77d0eadf50c634b4084f9a248c78402e7458/android_webview/java/src/org/chromium/android_webview/AwViewAndroidDelegate.java

Reminder to please merge to M64 branch 3282 soon.

michaelbai@, please merge to M64 branch 3282.

jaebaek@ You merged patch, didn't you? could you update the bug with the link of your merged patch?

merge into 3282 in patch https://chromium-review.googlesource.com/c/chromium/src/+/818679

I am so sorry about this mistake.
I will update it at the next Monday.

Please merge the approved cl(s) to M64 release branch 3282 as soon as possible.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/40f72b1d9136e7dc01d5b33f78a0e100869f1057

commit 40f72b1d9136e7dc01d5b33f78a0e100869f1057
Author: Jaebaek Seo <jaebaek@chromium.org>
Date: Mon Jan 08 16:09:23 2018

Relocate select popup of Android WebView

As shown in  crbug.com/786852 /#c9, the current select popup in Android WebView
is not correctly located. The main reason is that the left margin for the anchor
rectangle of the popup is added by x value of scroll manager. This CL adds y
value of scroll manager to the left margin instead.

Bug:  786852 
Change-Id: I8ebf983de64eea3c89d8fc7d2063962a7f1c7bb1
Reviewed-on: https://chromium-review.googlesource.com/818679
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Commit-Queue: Jaebaek Seo <jaebaek@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#523268}(cherry picked from commit 2b5e77d0eadf50c634b4084f9a248c78402e7458)
Reviewed-on: https://chromium-review.googlesource.com/822010
Cr-Commit-Position: refs/branch-heads/3282@{#444}
Cr-Branched-From: 5fdc0fab22ce7efd32532ee989b223fa12f8171e-refs/heads/master@{#520840}
[modify] https://crrev.com/40f72b1d9136e7dc01d5b33f78a0e100869f1057/android_webview/java/src/org/chromium/android_webview/AwScrollOffsetManager.java
[modify] https://crrev.com/40f72b1d9136e7dc01d5b33f78a0e100869f1057/android_webview/java/src/org/chromium/android_webview/AwViewAndroidDelegate.java

Verified on Black Berry Key Note /NMF26F, HTC A9/NRD90M , Galaxy S8/NRD90M having 64.0.3282.85, Issue mentioned with the attached apk in comment #23 is no longer reproducible.Thanks for the fix.