The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a8e335abf5558708b20d892d6fbc5c76f5a84c6a

commit a8e335abf5558708b20d892d6fbc5c76f5a84c6a
Author: Pavel Feldman <pfeldman@chromium.org>
Date: Thu Jan 25 03:41:21 2018

DevTools: don't update all frames aggresively upon render frame swap.

We used to detach from targets aggressively because of the timing of the
UpdateFrames call. Current frame host was still non-cross-process and hence
was detached from. This change migrates from bulk-frame update to treating
render frame host swap in AutoAttachToFrame.

Bug:  805248 
Change-Id: Id6c8a665676167fea5048c23db20cfc8fafd86f1
Reviewed-on: https://chromium-review.googlesource.com/882167
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531805}
[modify] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/content/browser/devtools/protocol/target_handler.cc
[modify] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/content/browser/devtools/render_frame_devtools_agent_host.h
[add] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/oopif-targets-expected.txt
[add] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/oopif-targets.js
[add] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/resources/iframe.html
[add] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/resources/inner-iframe.html
[add] https://crrev.com/a8e335abf5558708b20d892d6fbc5c76f5a84c6a/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/resources/page.html

Your change meets the bar and is auto-approved for M65. Please go ahead and merge the CL to branch 3325 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), bhthompson@(ChromeOS), govind@(Desktop)

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

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/+/63b964362f5466780cb6a8ff35f4b503b37f09cc

commit 63b964362f5466780cb6a8ff35f4b503b37f09cc
Author: Pavel Feldman <pfeldman@chromium.org>
Date: Wed Jan 31 18:54:35 2018

DevTools: don't update all frames aggresively upon render frame swap.

We used to detach from targets aggressively because of the timing of the
UpdateFrames call. Current frame host was still non-cross-process and hence
was detached from. This change migrates from bulk-frame update to treating
render frame host swap in AutoAttachToFrame.

TBR=pfeldman@chromium.org

(cherry picked from commit a8e335abf5558708b20d892d6fbc5c76f5a84c6a)

Bug:  805248 
Change-Id: Id6c8a665676167fea5048c23db20cfc8fafd86f1
Reviewed-on: https://chromium-review.googlesource.com/882167
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#531805}
Reviewed-on: https://chromium-review.googlesource.com/895908
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#210}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
[modify] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/content/browser/devtools/protocol/target_auto_attacher.cc
[modify] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/content/browser/devtools/protocol/target_auto_attacher.h
[modify] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/content/browser/devtools/protocol/target_handler.cc
[modify] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/content/browser/devtools/render_frame_devtools_agent_host.h
[add] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/oopif-targets-expected.txt
[add] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/oopif-targets.js
[add] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/resources/iframe.html
[add] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/resources/inner-iframe.html
[add] https://crrev.com/63b964362f5466780cb6a8ff35f4b503b37f09cc/third_party/WebKit/LayoutTests/http/tests/devtools/oopif/resources/page.html