Pls apply appropriate OSs label. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e72dcf29d2274244876e5b0d4e32a1e36c06d88c

commit e72dcf29d2274244876e5b0d4e32a1e36c06d88c
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Sat Jan 27 15:28:16 2018

[DevTools] Fix performance problems with OOPIFs

- linear lookup changed to map;
- NotifyNavigated just once per frame;
- do not attach to service worker from each OOPIF.

Bug:  805757 
Change-Id: I1c912cf52fb74afc5eeb8a9fe8ae35f422eda8c9
Reviewed-on: https://chromium-review.googlesource.com/885244
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532223}
[modify] https://crrev.com/e72dcf29d2274244876e5b0d4e32a1e36c06d88c/content/browser/devtools/devtools_agent_host_impl.cc
[modify] https://crrev.com/e72dcf29d2274244876e5b0d4e32a1e36c06d88c/content/browser/devtools/devtools_agent_host_impl.h
[modify] https://crrev.com/e72dcf29d2274244876e5b0d4e32a1e36c06d88c/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/e72dcf29d2274244876e5b0d4e32a1e36c06d88c/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/e72dcf29d2274244876e5b0d4e32a1e36c06d88c/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/e72dcf29d2274244876e5b0d4e32a1e36c06d88c/content/browser/devtools/render_frame_devtools_agent_host.h

[Auto-generated comment by a script] We noticed that this issue is targeted for M-65; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-65 label, otherwise remove Merge-TBD label. Thanks.

dgozman@ Request you to please provide steps to verify this CL on the latest Chrome builds if manual verification is required for this issue.

Thanks..

There is no way to manually verify this. Things should just be faster with a lot of OOPIFs.

Pls merge your change to M65 branch 3325 ASAP so we can pick it up for next M65 dev release. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b10589c11c5832e99df620d1a3e113cc84bf49bb

commit b10589c11c5832e99df620d1a3e113cc84bf49bb
Author: Dmitry Gozman <dgozman@chromium.org>
Date: Wed Jan 31 21:40:54 2018

[DevTools] Fix performance problems with OOPIFs

- linear lookup changed to map;
- NotifyNavigated just once per frame;
- do not attach to service worker from each OOPIF.

(cherry picked from commit e72dcf29d2274244876e5b0d4e32a1e36c06d88c)

Bug:  805757 
Change-Id: I1c912cf52fb74afc5eeb8a9fe8ae35f422eda8c9
Reviewed-on: https://chromium-review.googlesource.com/885244
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#532223}
Reviewed-on: https://chromium-review.googlesource.com/896106
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#215}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
[modify] https://crrev.com/b10589c11c5832e99df620d1a3e113cc84bf49bb/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/b10589c11c5832e99df620d1a3e113cc84bf49bb/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/b10589c11c5832e99df620d1a3e113cc84bf49bb/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/b10589c11c5832e99df620d1a3e113cc84bf49bb/content/browser/devtools/render_frame_devtools_agent_host.h