a80a9fef26b7e695e4072293aad8f6b7bdce613d
[ Merge of http://go/wvgerrit/150630 ] DeviceFiles uses a static variable for tracking license IDs which have been reserved by a CDM session before officially storing the license on the device. This variable was not protected by a mutex, and a rare race condition would arise, either crashing the service or getting it stuck in a loop. This CL adds a mutex for protecting the set of reserved IDs. Bug: 226555704 Test: device_files_unittest Change-Id: Icdea88673c76c267b4b7db79697ec52ae8e2581e
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