Adding Proj-PlzNavigate-Blocking given the ReleaseBlock-Stable label.

Maybe a good task for Jinsuk since this is an Android-specific PlzNavigate problem?

navigation_request.cc:277:

  // TODO(clamy): See how we should handle override of the user agent when the
  // navigation may start in a renderer and commit in another one.

On the first look, I think the flag (user agent override) can be copied over from the last committed navigation entry (not from the pending entry which is null) to make it persist in the renderer-initiated navigation. 

jam@ fixed at least one bug with Request Desktop Site and PlzNavigate in  issue 705218 . Is this a new regression or has it been like that for a while?

 Issue 705218  fixed the bug in the description but this is about another bug - RDS setting doesn't stick. Click a new link, and RDS setting gets lost. 

 Issue 734974  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c7616c7db94822e05489004042923b0df02882ed

commit c7616c7db94822e05489004042923b0df02882ed
Author: Jinsuk Kim <jinsukkim@chromium.org>
Date: Mon Jun 26 17:48:37 2017

Set UA override flag for Renderer-initiated NavigationRequest

Use last committed NavigationEntry instead of the pending endtry
(which can be null) to have the user agent override flag stick
across navigations. The entry can affect navigation entry id
but it is safe to replace it since the id used for browser-initiated
navigation only.

BUG= 734772 

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Icb34f55af82bafde5a3c0e1457fa25c1172db9d0
Reviewed-on: https://chromium-review.googlesource.com/541277
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#482311}
[modify] https://crrev.com/c7616c7db94822e05489004042923b0df02882ed/content/browser/frame_host/navigation_request.cc
[modify] https://crrev.com/c7616c7db94822e05489004042923b0df02882ed/content/browser/frame_host/navigation_request.h
[modify] https://crrev.com/c7616c7db94822e05489004042923b0df02882ed/content/browser/frame_host/navigator_impl.cc

This bug requires manual review: M60 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

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

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8520d829abf95ddfd04171323373422ebe57a4d2

commit 8520d829abf95ddfd04171323373422ebe57a4d2
Author: Jinsuk Kim <jinsukkim@chromium.org>
Date: Wed Jun 28 21:03:54 2017

PlzNavigate: Add a test for user agent overriding

This CL adss a browser test that ensures the user setting
'Request Desktop Site' is preserved when navigated to next
entry via a link click.

BUG= 734772 

Change-Id: Ic015352ee7f97d7ccb3b479010087a69bcf8c006
Reviewed-on: https://chromium-review.googlesource.com/552645
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#483137}
[modify] https://crrev.com/8520d829abf95ddfd04171323373422ebe57a4d2/chrome/android/javatests/src/org/chromium/chrome/browser/NavigateTest.java

Approved for M60 branch 3112.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/790356ce6c03c372d5fe2310f4e319265441f231

commit 790356ce6c03c372d5fe2310f4e319265441f231
Author: John Abd-El-Malek <jam@chromium.org>
Date: Thu Jun 29 23:17:55 2017

Set UA override flag for Renderer-initiated NavigationRequest

Use last committed NavigationEntry instead of the pending endtry
(which can be null) to have the user agent override flag stick
across navigations. The entry can affect navigation entry id
but it is safe to replace it since the id used for browser-initiated
navigation only.

BUG= 734772 

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Icb34f55af82bafde5a3c0e1457fa25c1172db9d0
Reviewed-on: https://chromium-review.googlesource.com/541277
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#482311}
Review-Url: https://codereview.chromium.org/2966573003 .
Cr-Commit-Position: refs/branch-heads/3112@{#496}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}

[modify] https://crrev.com/790356ce6c03c372d5fe2310f4e319265441f231/content/browser/frame_host/navigation_request.cc
[modify] https://crrev.com/790356ce6c03c372d5fe2310f4e319265441f231/content/browser/frame_host/navigation_request.h
[modify] https://crrev.com/790356ce6c03c372d5fe2310f4e319265441f231/content/browser/frame_host/navigator_impl.cc

Apologies, applied the wrong component in bulk.