From go/chrome-ux-gm2:
https://docs.google.com/presentation/d/1EO7TOpIMJ7QHjaTVw9St-q6naKwtXX2TwzMirG5EsKY/edit#slide=id.g34d24941d1_6_0

I'll start taking a stab at this.

Update estimated days remaining, please.

Ping. See C#7.

Sure, I think it's fair as a P2 though, but we need it for release.

Bumping this to M70.

I'm still a good owner since I have started, so taking back and adding more padding. :)

Duping these feels like a bugmorph of the other bug.  This bug is mostly about visual appearance and that bug is, at least originally, about showing the spinner less often.

Are we still capturing the "change when this shows" aspect on the other bug?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3

commit 18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3
Author: Peter Boström <pbos@chromium.org>
Date: Wed Oct 31 19:03:50 2018

Create new tab-loading animation

This implements three parts of the new tab-loading animation:

* Bottom bouncing pill of the indeterminate waiting state.
* Painting the loading state.
* Fading out the loading state animation once progress hits 100%.

This also makes all BrowserView tab animations' indeterminate state run
off of the same timer so this animation stays in sync across multiple
tabs. This timer restarts every time the animation timer starts, so the
first visible animation starts at 0 but following ones use the same
elapsed time as the already-running one.

Bug:  chromium:822067 
Change-Id: I7f5c38a92dc26556d11a01765831497027913f38
Reviewed-on: https://chromium-review.googlesource.com/c/1060605
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604356}
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/browser.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/browser.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/frame/browser_view.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/frame/browser_view.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_icon.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_icon.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_renderer_data.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_renderer_data.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_strip.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_strip.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/browser/ui/views/tabs/tab_unittest.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/common/chrome_features.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/chrome/common/chrome_features.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/content/browser/frame_host/frame_tree.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/content/browser/web_contents/web_contents_impl.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/content/browser/web_contents/web_contents_impl.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/content/public/browser/web_contents.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/ui/gfx/color_palette.h
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/ui/gfx/paint_throbber.cc
[modify] https://crrev.com/18a40fa1b32e4daccf4ea0d9824b38c13fcc9ac3/ui/gfx/paint_throbber.h

Landed in Canary, I'm expecting us to have to do various levels of polish and issue fixes, but I think those should be separate bugs once they appear.