commit 98b8d31add0109b93b931ebc34f5a804f4940691
author Fyodor Kupolov <fkupolov@google.com> Wed May 10 16:31:21 2017 -0700
committer Fyodor Kupolov <fkupolov@google.com> Wed May 10 16:46:22 2017 -0700
tree 9e8ae3a3557a375a1c5431392fdde0c11cebf0c8
parent 62643dddc7824d33862155d05b19c57cb01b0ef2

Use buffered DataInputStream vs RandomAccessFile

Switching to buffered streams saved up to 50% of
BackupManagerService.onUnlockUser time:

Before:
SystemServiceManager: Service com.android.server.backup.BackupManagerService$Lifecycle took 389 ms in onUnlockUser
SystemServiceManager: Service com.android.server.backup.BackupManagerService$Lifecycle took 380 ms in onUnlockUser
After:
SystemServiceManager: Service com.android.server.backup.BackupManagerService$Lifecycle took 178 ms in onUnlockUser
SystemServiceManager: Service com.android.server.backup.BackupManagerService$Lifecycle took 155 ms in onUnlockUser

Test: manual
Bug: 37686433
Change-Id: I41185a88e8377b434fab6a3bf1fd7086758127cd