GitLab

Adds WrenchMenuBadgeController which is responsible for notifying toolbar 
UI implementations (i.e. views and cocoa) about how they should be badged. 

Logic is moved from Cocoa and Views toolbar implementations and from 
wrench_icon_painter.cc to this new class. 

This refactor allows to easily expand the functionality of this class to add 
new sources of badging without needing to make the same changes to 
several platform-specific implementations. 

No functional changes. 

BUG=394855

Review URL: https://codereview.chromium.org/395193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284084 0039d316-1c4b-4281-b951-d872f2087c98