The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/616ef937bf6ab6a0400b964dd0fdd0aacfbdc119

commit 616ef937bf6ab6a0400b964dd0fdd0aacfbdc119
Author: Malay Keshav <malaykeshav@chromium.org>
Date: Fri Jun 15 17:24:07 2018

Use accurate zoom factor to compute logical resolution

The logical resolution that we display on the display settings page uses
the rounded zoom factor value to do its computation. This gives an
inaccurate logical resolution text. This also results in us being unable
to tag the correct native resolution in the UI.

The rounded number is also used to set the display zoom of the display
which causes problems when the native resolution can only be reached by
a non rounded zoom factor value like in the case of a 1.6 DSF device.

Bug:  853020 
Change-Id: Iba7c70c214ba57f8b21bcac72ebc0e86caeff878
Component: Display settings, display size slider
Reviewed-on: https://chromium-review.googlesource.com/1101936
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567708}
[modify] https://crrev.com/616ef937bf6ab6a0400b964dd0fdd0aacfbdc119/chrome/browser/resources/settings/device_page/display.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/56833b2a4a597c36a35b39566d41d3bfc5e10dbb

commit 56833b2a4a597c36a35b39566d41d3bfc5e10dbb
Author: Malay Keshav <malaykeshav@chromium.org>
Date: Fri Jun 15 17:33:04 2018

(merge) Use accurate zoom factor to compute logical resolution

The logical resolution that we display on the display settings page uses
the rounded zoom factor value to do its computation. This gives an
inaccurate logical resolution text. This also results in us being unable
to tag the correct native resolution in the UI.

The rounded number is also used to set the display zoom of the display
which causes problems when the native resolution can only be reached by
a non rounded zoom factor value like in the case of a 1.6 DSF device.

Bug:  853020 
Change-Id: Iba7c70c214ba57f8b21bcac72ebc0e86caeff878
Component: Display settings, display size slider
Reviewed-on: https://chromium-review.googlesource.com/1101936
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#567708}(cherry picked from commit 616ef937bf6ab6a0400b964dd0fdd0aacfbdc119)
Reviewed-on: https://chromium-review.googlesource.com/1102698
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#377}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[modify] https://crrev.com/56833b2a4a597c36a35b39566d41d3bfc5e10dbb/chrome/browser/resources/settings/device_page/display.js