I have enabled #views-cast-dialog, but I cannot get the cast icon on the toolbar. I tried reproduce the issue with the sign in icon, but I can not reproduce it successfully.

If you select "Cast..." from the three dots menu, can you make the icon show? You can pin the icon to the toolbar by right clicking on the icon and selecting "Always show icon".

Got the cast icon this time, but I still cannot reproduce this issue with https://chromium.googlesource.com/chromium/src/+/35a89996082e62d93f8c0eac6aaadfb6bf6f8acb

I have reproduced it. The problem only happens after a renderer is crashed on my box. 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d7aaf7831522612e6e4c947c29eb767e88e271f1

commit d7aaf7831522612e6e4c947c29eb767e88e271f1
Author: Peng Huang <penghuang@chromium.org>
Date: Wed Jan 09 22:03:08 2019

Fix a rendering issue with RasterDecoder

DoCopySubTexture may modifies GL global context state, we need
restore them, otherwise RasterDecoderContextState::context_state
will become dirty.

Bug:  918929 
Change-Id: I3d1a506b6410d215baa2e3a3a08db52395f30225
Reviewed-on: https://chromium-review.googlesource.com/c/1403337
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621302}
[modify] https://crrev.com/d7aaf7831522612e6e4c947c29eb767e88e271f1/gpu/command_buffer/service/raster_decoder.cc
[modify] https://crrev.com/d7aaf7831522612e6e4c947c29eb767e88e271f1/gpu/command_buffer/service/raster_decoder_context_state.cc
[modify] https://crrev.com/d7aaf7831522612e6e4c947c29eb767e88e271f1/gpu/command_buffer/service/raster_decoder_context_state.h

Thank you for the fix!

Unable to reproduce the issue on reported chrome version #73.0.3642.0 using Linux 17.10 by following below steps:

Steps:
===== 
1.Launched chrome. 
2. Enabled  view cast dialog from chrome://flags 
3.Enabled cast icon 
4. clicked on cast icon and hovered over other extension icons as per comment#0
Observation : Didn't see any color drop on cast icon.
Attached screencast for reference.
@Peng : Could you please review attached screencast and let us know if anything is being missed here. And please help us in verifying the fix.

Thanks.!  

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I reproduce it by following steps.
1. Go to web store
2. Click add to chrome button for any chrome extension.
3. Click cancel button for to confirm dialog.
4. Press the cast icon
5. The problem happens.

Tried testing the issue on reported chrome version #73.0.3642.0 on Ubuntu 17.10 by following below steps.

Steps:
=====
1.Launched chrome.
2.Enabled #views-cast-dialog in "chrome://flags".
3.Navigated to "about:crash" for renderer crash.
4.Navigated to "chrome://apps".
5.Opened a chrome extension and clicked on "add to chrome" button.
6.On confirm dialogue clicked on the cancel button.
7.Clicked "cast" icon and hovered over other icons.
8.Unable to observe any change in colour of "cast" icon.

Attached screencast for reference.
@Peng Huang: Could you please review attached screencast and let us know if anything is being missed from our end. Requesting you to help us in verifying this on upcoming Linux dev.
Thanks.!

Deleted: 918929.webm 6.6 MB

	918929.webm 6.6 MB View Download

Can you past about:gpu page here? 
I think this issue only happens with use_virtualized_gl_contexts. You may check it in about:gpu page "Driver Bug Workarounds" section.

In Reply to comment#11,

@Peng Huang: Please find the attached GPU details of the system.

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The virtualized gl context is not enabled on your machine. You may try launch chrome with flag --use_virtualized_gl_contexts=1.