Fix binder force gc will block binder thread

Symptom: Force gc caused activity launch time took longer
Root Cause: Runtime.getRuntime().gc will block binder thread
Solution: Use VMRuntime.requestConcurrentGC() will not block binder
thread

Bug: 20554807
Change-Id: I48a103c8241c4c85ced4d9a0b231d9f1dc200f35
1 file changed