This bug is for pushing the Edit VCs onto the existing navigation stack, rather than presenting them as new top-level VCs.

Per UX, we are now going to use a separate presentation for the "Edit" screens, rather than pushing them onto the existing stack.  We'd like to use the same bubble presentation, but have the view animate in from the bottom of the screen rather than from the trailing edge.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/230c7c096a6f1fe6daa2aa4ef68a739522a55deb

commit 230c7c096a6f1fe6daa2aa4ef68a739522a55deb
Author: Rohit Rao <rohitrao@chromium.org>
Date: Wed Jun 06 15:36:53 2018

[ios] Uses BookmarkInteractionController to present bookmark editor VCs.

The interaction controller is functionally acting as a coordinator, so
BookmarkHomeViewController now uses it to present editor view
controllers.  BookmarkInteractionController supplies APIs to present an
editor for a given BookmarkNode and abstracts away the actual
presentation and specific view controller subclasses used.

BUG= 805182 

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie7c7200766439d0acd161a1c94d20249a17d861e
Reviewed-on: https://chromium-review.googlesource.com/1081013
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564901}
[modify] https://crrev.com/230c7c096a6f1fe6daa2aa4ef68a739522a55deb/ios/chrome/browser/ui/bookmarks/BUILD.gn
[modify] https://crrev.com/230c7c096a6f1fe6daa2aa4ef68a739522a55deb/ios/chrome/browser/ui/bookmarks/bookmark_home_view_controller.mm
[modify] https://crrev.com/230c7c096a6f1fe6daa2aa4ef68a739522a55deb/ios/chrome/browser/ui/bookmarks/bookmark_interaction_controller.h
[modify] https://crrev.com/230c7c096a6f1fe6daa2aa4ef68a739522a55deb/ios/chrome/browser/ui/bookmarks/bookmark_interaction_controller.mm
[add] https://crrev.com/230c7c096a6f1fe6daa2aa4ef68a739522a55deb/ios/chrome/browser/ui/bookmarks/bookmark_interaction_controller_delegate.h
[modify] https://crrev.com/230c7c096a6f1fe6daa2aa4ef68a739522a55deb/ios/chrome/browser/ui/browser_view_controller.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3746a476b3459beee3468461bbf3c1922b75a975

commit 3746a476b3459beee3468461bbf3c1922b75a975
Author: Rohit Rao <rohitrao@chromium.org>
Date: Wed Jun 13 21:56:01 2018

[ios] Uses a bubble presentation for the bookmarks editors.

BUG= 805182 

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I56014e0e6db3a8b1439d6306dee0041a3916eb31
Reviewed-on: https://chromium-review.googlesource.com/1086275
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567007}
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmark_folder_editor_view_controller.mm
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmark_interaction_controller.mm
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmark_transitioning_delegate.h
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmark_transitioning_delegate.mm
[modify] https://crrev.com/3746a476b3459beee3468461bbf3c1922b75a975/ios/chrome/browser/ui/bookmarks/bookmarks_egtest.mm

The NextAction date has arrived: 2018-06-20