Brian, could you take a look at this?

Hi, are you able to bisect where it went wrong?

Or, I guess you have a fix suggestion, so maybe the bisect isn't needed if the bug is understandable from there :)

In Yandex.Browser we use mask filter for UI bubbles.
It broke when we merged chromium 58.0.3007.3.
But I don't know does chromium use this filters for UI ( I think it doesn't ), so I can't easily bisect chromium.

I believe this is a dupe of  Issue 720325  but cc'ing Robert to confirm.

Hm, It is strange, because I can repro bug in the latest master:

commit 14b5a11abcadd47e2b7bf5baf1f6f545232f520f
Author: tjbecker <tjbecker@google.com>
Date:   Tue Jun 6 13:01:27 2017 -0700

    Fix High_Level-Bindings-APIs link

    There was a typo in the markdown link.

    Review-Url: https://codereview.chromium.org/2928633002
    Cr-Commit-Position: refs/heads/master@{#477383}

Run: cc_unittests.exe --gtest_filter=*EnlargedTextureWithAlphaThresholdFilter* --use-gpu-in-tests --disable-d3d11

The following revision refers to this bug:
  https://skia.googlesource.com/skia/+/5ab7276a35906734b017add5cc37fd8cf477a63b

commit 5ab7276a35906734b017add5cc37fd8cf477a63b
Author: Robert Phillips <robertphillips@google.com>
Date: Wed Jun 07 17:27:54 2017

Suppress rendererability of kAlpha8 GL_CHROMIUM_framebuffer_multisample for ANGLE D3D9

For ANGLE D3D9 ES2 we're seeing GL_CHROMIUM_framebuffer_multisample but not GL_ANGLE_framebuffer_multisample.
The same occurs for ANGLE D3D11 ES2 but kAlpha8 is renderable in that case.

Bug:  730082 
Change-Id: I7eda844b0ad48150d19406517d1dfbe453e9e478
Reviewed-on: https://skia-review.googlesource.com/18980
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

[modify] https://crrev.com/5ab7276a35906734b017add5cc37fd8cf477a63b/src/gpu/gl/GrGLGpu.cpp
[modify] https://crrev.com/5ab7276a35906734b017add5cc37fd8cf477a63b/src/gpu/gl/GrGLCaps.h
[modify] https://crrev.com/5ab7276a35906734b017add5cc37fd8cf477a63b/src/gpu/gl/GrGLCaps.cpp

 crbug.com/720325  involved incorrect RG support information in ANGLE D3D9. In this bug we are/were incorrectly assuming A8 support.

https://skia-review.googlesource.com/18980 sorts out the Skia caps settings for this bug.

Wrt getting this working with M58 I suggest applying the following CLs to your M58 fork:
   ANGLE: https://chromium-review.googlesource.com/c/523023/
   Skia: https://skia-review.googlesource.com/18980

I don't necessarily think we want to merge this back to M-60 (since we're not seeing bug reports about this) but I thought it should be on the branch managers' radar.

Thank you for fix!

I think we can close this issue.

Your change meets the bar and is auto-approved for M60. Please go ahead and merge the CL to branch 3112 manually. Please contact 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

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

Please merge the patch to M60 branch(3112),Beta RC cut is scheduled @ 4.00 PM PST tomorrow(06/13).

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

Ping..

I think it can be done only by googler, not me.
robertphillips@chromium.org ?

Assigning to Robert to merge the patch.

The following revision refers to this bug:
  https://skia.googlesource.com/skia/+/a46f69bf6f3283c8ee71674617f3eb27ad905565

commit a46f69bf6f3283c8ee71674617f3eb27ad905565
Author: Robert Phillips <robertphillips@google.com>
Date: Thu Jun 22 19:27:03 2017

[M60 cherry pick] Suppress rendererability of kAlpha8 GL_CHROMIUM_framebuffer_multisample for ANGLE D3D9

For ANGLE D3D9 ES2 we're seeing GL_CHROMIUM_framebuffer_multisample but not GL_ANGLE_framebuffer_multisample.
The same occurs for ANGLE D3D11 ES2 but kAlpha8 is renderable in that case.

TBR=bsalomon@google.com

No-Tree-Checks: true
No-Try: true
No-Presubmit: true
Bug:  730082 
Change-Id: I2b1ca8da85428426ccdfd2c31d1aa0fd59acb8f9
Reviewed-on: https://skia-review.googlesource.com/20513
Reviewed-by: Ravi Mistry <rmistry@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

[modify] https://crrev.com/a46f69bf6f3283c8ee71674617f3eb27ad905565/src/gpu/gl/GrGLGpu.cpp
[modify] https://crrev.com/a46f69bf6f3283c8ee71674617f3eb27ad905565/src/gpu/gl/GrGLCaps.h
[modify] https://crrev.com/a46f69bf6f3283c8ee71674617f3eb27ad905565/src/gpu/gl/GrGLCaps.cpp