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Check Activity state before PiP state update
Check Activity state before sending the PictureInPictureUiState update to the client. Activity could have been destroyed in app process, while it's still attached. Flag: EXEMPT testfix Bug: 412980276 Test: atest CtsWindowManagerDeviceActivity Change-Id: I13bc246099e23c21c8e16bfb97f5259ffc2095d3