Fix race in TelephonyScanManager
TelephonyScanManager may sometimes encounter a race condition where Telephony sends it the first scan result before it has saved the returned scan ID. This causes a crash in the app that's requesting the scan. To fix this, synchronize on mScanInfo while requesting the network scan so that the handler in TelephonyScanManager will wait for the scan ID to be saved before processing the first message from Telephony. Bug: 142068098 Test: manual Change-Id: I0b2b4c6dc749e21641843818293941704ed870a6
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