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Design doc: go/appservice-adaptive-icon

The related ARC icon interfaces are modified/added to use the new
structure RawIconPngData, and call AppService interfaces to
decode/encode the icon.

The ARC side CL number is 12024464, which has use the new
OnTaskDescriptionUpdated interface. And we can't call both the new and
old task update interfaces, that could cause updating twice for the icon
on the windows, so we have to select 1(the new one) to use in the code.

Once the ARC side CL is submitted, the change on the Chromium side will
be change to use the new interface as soon as possible.

TODO: Add some test cases for adaptive icons and implement the new
interfaces for FakeAppInstance.

Note: Below 2 files will be deleted soon. They are modified to pass the
build:
chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.h
chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc

BUG=1083331

Change-Id: I8daaa1643dd20c6038d685863c8f6e71c3948c7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251600Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Long Cheng <lgcheng@google.com>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786071}