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When app is pinned, icon image is loaded via controller using loader
owner by chrome launcher controller. Once new ARC app window appears in
the system, it's icon is loaded asynchronously. In this flow, default
app icon is applied first and then, once real image is loaded final icon
is set. Each update of ARC window icon is reflected on shelf. That
means default app icon appear on the shelf for a moment and in most cases
this is very noticeable.
This CL prevents setting default app in favor of final app icon and
default icon is set only as a fallback when final icon could not be
loaded.

TEST=Manual
BUG=b:114246197

Change-Id: I2de9e9d99b313f7538dce9dd732164335f32a42a
Reviewed-on: https://chromium-review.googlesource.com/1212348
Commit-Queue: Yury Khmel <khmel@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589627}