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Enabling the flag for UsePaintRecordForImageSkia fixes the issue. 
Landing a change to enable the flag by default on Chrome OS.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/13657ca1e89d716d4566085fee50e8fe83ab5cc7

commit 13657ca1e89d716d4566085fee50e8fe83ab5cc7
Author: Malay Keshav <malaykeshav@chromium.org>
Date: Fri Oct 12 23:53:15 2018

Enable UsePaintRecordForImageSkia for Chrome OS

GPU rasterization for Chrome OS is being enabled but it causes a
regression in the rendering of vector icons at fractional scales most
likely due to its interaction with Pixel Canvas. It seems like the
vector icons are being rescaled after rasterization to get the correct
scale images. This results in the broken and blurry icon bitmaps. Using
PaintRecords instead of rasterized bitmaps fixes this bug, as scaling
on PaintRecords is sharp.

Bug:  894901 
Change-Id: I1cd541927b7aaa032780b15d66df2a69f45c18e4
Component: Images, vector icons, Chrome OS
Reviewed-on: https://chromium-review.googlesource.com/c/1279068
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599423}
[modify] https://crrev.com/13657ca1e89d716d4566085fee50e8fe83ab5cc7/ui/gfx/switches.cc

The merge request for m71 is only for Chrome OS. Other platforms will not be affected.

Your change meets the bar and is auto-approved for M71. Please go ahead and merge the CL to branch 3578 manually. Please contact milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), kbleicher@(ChromeOS), govind@(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/+/9467f94c9c7ac2e639391c94464088281c2a9adf

commit 9467f94c9c7ac2e639391c94464088281c2a9adf
Author: Malay Keshav <malaykeshav@chromium.org>
Date: Wed Oct 17 20:24:02 2018

[m71] Enable UsePaintRecordForImageSkia for CrOS on M71

We have UsePaintRecordForImageSkia feature enabled for all platforms
post m72. But this flag needs to be enabled for CrOS on m71 as ui-GPU
rasterization for CrOS is being enabled in this milestone.

The master branch change can be found here:
https://chromium-review.googlesource.com/c/chromium/src/+/1279068

Bug:  894901 
Change-Id: Iffc5ba99727aa155b7a6237ccab917fe6d7e0659
Component: Images, vector icons, Chrome OS
Reviewed-on: https://chromium-review.googlesource.com/c/1281237
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#96}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}
[modify] https://crrev.com/9467f94c9c7ac2e639391c94464088281c2a9adf/ui/gfx/switches.cc

The following revision refers to this bug: 
https://chromium.googlesource.com/chromium/src.git/+/9467f94c9c7ac2e639391c94464088281c2a9adf

Commit: 9467f94c9c7ac2e639391c94464088281c2a9adf
Author: malaykeshav@chromium.org
Commiter: malaykeshav@chromium.org
Date: 2018-10-17 20:24:02 +0000 UTC

[m71] Enable UsePaintRecordForImageSkia for CrOS on M71

We have UsePaintRecordForImageSkia feature enabled for all platforms
post m72. But this flag needs to be enabled for CrOS on m71 as ui-GPU
rasterization for CrOS is being enabled in this milestone.

The master branch change can be found here:
https://chromium-review.googlesource.com/c/chromium/src/+/1279068

Bug:  894901 
Change-Id: Iffc5ba99727aa155b7a6237ccab917fe6d7e0659
Component: Images, vector icons, Chrome OS
Reviewed-on: https://chromium-review.googlesource.com/c/1281237
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#96}
Cr-Branched-From: 4226ddf99103e493d7afb23a4c7902ee496108b6-refs/heads/master@{#599034}