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AppService creates standard circle icons for all apps. However, there
are a few cases that icons on shelf are not app icons, e.g.:
1. Task manager
2. A few extensions show icons when open a new window, e.g. google
hangouts.

This CL create standard circle icons for them when they are shown on
shelf.

Modify TaskManagerView to create standard icon when running in Chrome
OS.

Modify ChromeLauncherController::OnAppImageUpdated. If the icon is not
loaded by AppServiceAppIconLoader (which loads the standard circle
icons), create standard icons.

BUG=1162514
BUG=1142373

Change-Id: Ibfe40c33944a1120ca9c991c4953d0da906ee2e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624273
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842874}