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The goal is to make Mobile network status be more apparent
to the user, even when WiFi or Ethernet network is connected.

To do this we now have independent tray network icons. One
Tracks Wi-Fi, the other Mobile network state.

This cl adds different rendering strategies for network
icons in the system tray.

In the future we may also want to allow Tethering icon to be
displayed on its own. We can add a new strategy when the spec
is ready.

Feature is developed behind feature flag 'SeparateNetworkIcons'.

Bug: 902409
Change-Id: I878aa4fbe02676bd235eba60979155fb57207175
Reviewed-on: https://chromium-review.googlesource.com/c/1340807
Commit-Queue: Tony De Luna <tonydeluna@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Mitsuru Oshima (OOO till 11/26) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610232}