DisplayMetrics are used in some downstream branches and need to be mocked. This avoids merge conflicts in NetworkNotificationManagerTest. Partial cherry-pick of change IDs: I35d28c8df341dbbac2774026c6ca749e296c0482 I1aeed1c79e4a829d8829eb08224f9b21fafc50fe Test: atest NetworkNotificationManagerTest Bug: 176239013 Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f Change-Id: I118ec1af615aef36293bf0b480389f766122ccab