(And for the less familiar, "recent view" is what you get when you click the button in the bottom left on chromeos. "app-list view" is when you then click the "All Apps" button on the "recent view")

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8c1f6622f0279ee6062496672a7b83317b579486

commit 8c1f6622f0279ee6062496672a7b83317b579486
Author: khmel <khmel@chromium.org>
Date: Thu May 11 19:15:07 2017

Refactor extension app icon.

We have several independent places where we decided how extension icon
is represented. We have separate logic for the shelf, recent view, app
list and app info icons. Icon look depends on type of app and some
external conditions. This leads to situation that extension App icon
looks differently in different places. Yet another problem is non-stable
applying Chrome badging in case corresponded ARC app is installed or
uninstalled.

Solution is to provide centrilized place where app icon is processed
and all consumers should use. ChromeAppIcon is introduced that applies all necessary effects based on current environment and app type. ChromeAppIconService is introduced to refer all created icons,
monitor environment changes and updating the icon. Resulting icon
image is sent to consumer via ChromeAppIconDelegate interface.

BUG= 712729 
BUG= 703366 
BUG=b/37418449
Test=Manually on device. Existing tests passed.

TBR=yoshiki@chromium.org

Review-Url: https://codereview.chromium.org/2819413003
Cr-Commit-Position: refs/heads/master@{#471035}

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