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This class translates the PhoneHubManager state into the corresponding
UI state and view that is shown in the tray bubble. Each state has
it's own view class and the PhoneHubTray bubble transitions through
these content views as the UI state changes.

This CL also refactors PhoneConnectedView into it's own class.

BUG=1106937,1126208

Change-Id: Ie012077a1905f80be91fbfb0b084d89219bd6c26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427060
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810942}