I'll look into it.
This is the same as another bug. The LocalSurfaceId update isn't being displayed.

Thanks. Please note that the culprit CLs are different.

Oh. Thank you.

I suspect when I fix one I'll end up fixing both. But I'll make sure to carefully check that.

I'm removing the dupe as this is a separate bug.

To reproduce this, you need to have not dismissed the Cast dialog's tutorial. If you have already dismissed it with the "OK Got It" button, you can effectively reset the tutorial with: $ out/Release/Chromium.app/Contents/MacOs/Chromium --user-data-dir=/tmp/aodjgw or whatever random subdir

This repros about 1 in 10 runs.

Applying M68 stable blocker label per comment in - https://bugs.chromium.org/p/chromium/issues/detail?id=840006#c26.

In my case (68.0.3427.0 Canary), I can reproduce this only when there is no welcome message. When the welcome message is there, the resize to show the welcome message makes the dialog transition away from the blank state.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e7b12316377b002c950e028ab69d31bc0c2000d4

commit e7b12316377b002c950e028ab69d31bc0c2000d4
Author: Chris Blume <cblume@chromium.org>
Date: Mon May 14 20:09:04 2018

Revert child allocation in M67.

This reverts commit 760b946849da9bd7a638418a762712f678a2e017.

In M67 we hit a bug where a child allocation might not be
presented unless it also has a resize event. This reverts
child allocation and returns to a well-tested state.

Bug:  840036 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I17546bb8ccd01318be6e88aa69bbeef3d3ade56a
Reviewed-on: https://chromium-review.googlesource.com/1058124
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#595}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/components/viz/common/surfaces/child_local_surface_id_allocator.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/components/viz/common/surfaces/parent_local_surface_id_allocator.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/frame_host/render_widget_host_view_guest.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/frame_host/render_widget_host_view_guest.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/browser_compositor_view_mac.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/browser_compositor_view_mac.mm
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_delegate.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_impl.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_impl.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_aura.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_aura.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_base.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_base.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_child_frame.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_child_frame.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_child_frame_browsertest.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_mac.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/renderer_host/render_widget_host_view_mac.mm
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/web_contents/web_contents_impl.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/browser/web_contents/web_contents_impl.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/common/view_messages.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/renderer/render_view_impl.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/renderer/render_widget.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/renderer/render_widget.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/renderer/render_widget_unittest.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/test/mock_render_widget_host_delegate.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/content/test/mock_render_widget_host_delegate.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/local/window_port_local.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/local/window_port_local.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/mus/window_port_mus.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/mus/window_port_mus.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/window.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/window.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/window_port.h
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/window_port_for_shutdown.cc
[modify] https://crrev.com/e7b12316377b002c950e028ab69d31bc0c2000d4/ui/aura/window_port_for_shutdown.h

I definitely tagged the wrong bug in that CL.
It was supposed to go to  http://crbug.com/840006 
This issue is not yet fixed / merged. Sorry about that.

I was able to repro a potentially different bug then.

I just tried again. On the 58th attempt I hit a bug. But it isn't a pure-white dialog. Instead, it was like the other bug where only a dot and the header is shown. Interestingly, I was sure to repro with the tutorial on. The tutorial wasn't yet displayed when the bug reproed.

I also was unable to repro with the tutorial off after 100 tries.

Maybe Fady's patch fixed the white, tutorial off bug. And maybe there is a separate dot, tutorial on bug?

On 68.0.3432.0, I'm no longer able to repro this bug after 100 tries. If Fady's patch landed between that and 68.0.3427.0, then it may have fixed it.

To be clear, you were unable to repro the no-tutorial bug, right?

I think a tutorial-on bug exists.

Right, with the welcome message closed, I wasn't able to repro the blank dialog bug.

I just opened the dialog with the welcome message 20 times, and was able to repro what I think is the same as the dot bug you mentioned in c#9, shown in the attached screenshot.

Deleted: mac_dialog_dot_2.png 11.6 KB

	mac_dialog_dot_2.png 11.6 KB View Download

The blank dialog bug is back (or never fixed?) in Canary 68.0.3437.2.
It reproduces 10/10 on some sessions and 0/10 on others, so it may be affected by a finch experiment. It reproduces regardless of the values for secoundary-ui-md and views-browser-windows though, so those flags aren't the culprit.

There also is another bug in Canary that's new to me, in which only the top part of the dialog is drawn, although the rest is still clickable. Please see the screenshot for this one.

Deleted: Screen Shot 2018-05-22 at 11.07.51 AM.png 17.4 KB

	Screen Shot 2018-05-22 at 11.07.51 AM.png 17.4 KB View Download

+takumif can you mark this as a mac views blocker to make sure it gets looked at before that ships

takumif@,

Please check the issue on latest chrome versions 69.0.3455.0/68.0.3440.17 on Mac ,if still issue persists please update the bug as per C#14.

Thanks..!

I'm no longer able to reproduce this locally. Either way, per c#13, this shouldn't be related to MacViews.

David, have you recently seen this issue on M68?

No longer repros.

[Auto-generated comment by a script] We noticed that this issue is targeted for M-68; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-68 label, otherwise remove Merge-TBD label. Thanks.

Seems like there isn't any merge required to M68, correct?

Right. Removing the Merge-TBD label.