Let's try to get this into M64 dev & M63 beta (unless there are objections). A couple questions:

 1) Is this enabled yet on trunk? If not, which bug can I follow for this?
 2) Is there a flag for this?

It's enabled by default on platforms other than Android. It's disabled on Android including WebView. The flag is LoadingWithMojo. The tracking issues are  issue 603396  and issue 703483.

What's the state of the finch experiment for m62 chrome right now?

Right now it's at 10% enabled, 10% control, and 80% default (i.e. disabled)
https://uma.googleplex.com/p/chrome/variations?sid=c1bf26e992efdb7ccd8d519c6540a8ef

The crashes on 62 look similar to without the experiment, so I would suspect we would ramp this up to 100%.

Can someone send the CL to append the flag for WebView? Example CL: https://chromium-review.googlesource.com/c/chromium/src/+/667502

Sounds like this will get enabled by default for android on trunk real soon. Can probably just wait for that

63 is also the first release with plznavigate. Not sure if there is value in waiting for a 63 beta to go out with plznavigate only first before enabling this on branch

@boliu: plznavigate and mojoloading are orthogonal.
Turning mojoloading on for m63, which should be pretty safe at this point, allows us to remove the old code one release earlier.

I just meant one build of m63. Like .1 has plznavigate only so we get a week of feedback with plznavigate only. Then .2 can have mojoloading as well.

@boliu: per Claude, the first 63 beta build will be cut in 2 hours, so you have your wish :) I'll send a cl to turn this on for webview.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6917671eb785e39d526dc11f1a9c4cd669669d95

commit 6917671eb785e39d526dc11f1a9c4cd669669d95
Author: John Abd-El-Malek <jam@chromium.org>
Date: Thu Oct 26 00:19:27 2017

Enable LoadingWithMojo for webview since it doesn't use Finch.

BUG= 778044 

Change-Id: Id6a82f4ee86c30dd8045a5ebea527f44ae3639fd
Reviewed-on: https://chromium-review.googlesource.com/738831
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511657}
[modify] https://crrev.com/6917671eb785e39d526dc11f1a9c4cd669669d95/android_webview/lib/aw_main_delegate.cc

This bug requires manual review: M63 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), gkihumba@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

All good! 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f1028ee5d1d96b381d237f9d2e4d2dc5f54c2a26

commit f1028ee5d1d96b381d237f9d2e4d2dc5f54c2a26
Author: John Abd-El-Malek <jam@chromium.org>
Date: Fri Oct 27 19:40:58 2017

Enable LoadingWithMojo for webview since it doesn't use Finch.

BUG= 778044 

Change-Id: Id6a82f4ee86c30dd8045a5ebea527f44ae3639fd
Reviewed-on: https://chromium-review.googlesource.com/738831
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#511657}(cherry picked from commit 6917671eb785e39d526dc11f1a9c4cd669669d95)
Reviewed-on: https://chromium-review.googlesource.com/742301
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/branch-heads/3239@{#270}
Cr-Branched-From: adb61db19020ed8ecee5e91b1a0ea4c924ae2988-refs/heads/master@{#508578}
[modify] https://crrev.com/f1028ee5d1d96b381d237f9d2e4d2dc5f54c2a26/android_webview/lib/aw_main_delegate.cc

Apologies, applied the wrong component in bulk.