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When the adaptive icon feature (DD:go/appservice-adaptive-icon) is
enabled, call AppServiceProxy's LoadIcon interface to generate the
standard icons for windows . Those windows icons are shown on the mini
window to switch between windows when click alt+tab. For some Chrome
apps, those window icons could be used to set the Shelf icon.

Modify the browser tests LauncherPlatformAppBrowserTest.SetIcon to
increaset the callback count, because AppServiceProxy's load icon could
update the window's icon. Also add the checking for the icon image.

Modify the browser tests WebAppIconManagerBrowserTest.SingleIcon to
check for the standard icon image.

Tests:
1. Manul tests
2. LauncherPlatformAppBrowserTest.SetIcon is used to test the change for
chrome_native_app_window_view*
3. WebAppIconManagerBrowserTest.SingleIcon is used to test the change
for web_app_browser_controller.*
4. HostedAppTest.LoadIcon is used to test the change for
hosted_app_browser_controller.*

BUG=1113576

Change-Id: Icf3e6ad2cbf3d0c01e0f8e2fc29e5742c1cb59ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2344428
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797108}