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Schedule a low priority (best effort) non-blocking PostTask when chrome
comes to the foreground or when a WebView MonoChrome process is created.
The task is responsible to show a launcher icon to open WebView DevTools
if monochrome is the current selected system webview provider otherwise
it hides the launcher icon.

The component (activity-alias) that shows the icon is disabled by
default and is only added to the manifest in build-time when GN argument
`webview_devui_show_icon=true` which is enabled by default for dev and
canary channels.

icon_webview is added to the activity-alias for monochrome so the
launcher icon for DevTools will be WebView icon not Monochrome. However, the icon the
application switcher will still show monochrome icon.

Bug: 1026062
Bug: 1026060
Test: select monochrome as webview implementation and launch monochrome browser, observe icon appearing
Test: select monochrome as webview implementation and launch webview shell browser, observe icon appearing
Test: select different webview implementation, launch monochrome and observe icon disappearing
Change-Id: I9c05aa9d8bcdddc016a06b62a5e76e2aa20f30a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2000724
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733974}