https://chromium-review.googlesource.com/c/chromium/src/+/704211

This should be in tomorrow's Canary. Take a look!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8e416ac9c6cef242f3368c9ac65b0611fbb91995

commit 8e416ac9c6cef242f3368c9ac65b0611fbb91995
Author: Sidney San Martín <sdy@chromium.org>
Date: Mon Oct 16 19:39:48 2017

New animations for MD downloads.

Much of the complexity is related to:

- Transitions being requested before others finish: Using cmd+S to save
  a page can go through indeterminate progress, determinate progress,
  and completion within a fraction of a second.

- Making sure things happen at the right moments: The completion
  animation shouldn't happen before progress finishes animating to 100%,
  and the filename should drop down in sync with the completion
  animation regardless of whether it waited for progress to change.

Bug:  768120 ,  767223 
Change-Id: I3881a48853ca002378a2fc86187ecc75b33469e5
Reviewed-on: https://chromium-review.googlesource.com/704211
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509141}
[modify] https://crrev.com/8e416ac9c6cef242f3368c9ac65b0611fbb91995/chrome/browser/ui/cocoa/download/download_shelf_controller.mm
[modify] https://crrev.com/8e416ac9c6cef242f3368c9ac65b0611fbb91995/chrome/browser/ui/cocoa/download/md_download_item_progress_indicator.h
[modify] https://crrev.com/8e416ac9c6cef242f3368c9ac65b0611fbb91995/chrome/browser/ui/cocoa/download/md_download_item_progress_indicator.mm
[modify] https://crrev.com/8e416ac9c6cef242f3368c9ac65b0611fbb91995/chrome/browser/ui/cocoa/download/md_download_item_view.mm
[modify] https://crrev.com/8e416ac9c6cef242f3368c9ac65b0611fbb91995/ui/base/BUILD.gn
[delete] https://crrev.com/ec3d9ebab41efcfdcea80a45d639848daf1b2161/ui/base/cocoa/quartzcore_additions.h
[delete] https://crrev.com/ec3d9ebab41efcfdcea80a45d639848daf1b2161/ui/base/cocoa/quartzcore_additions.mm

The animation looks perfect! thank you Sidney! :D

Great! I noticed an issue with themed windows ( issue 775618 ), take a look when you have a chance?