BLASTBufferQueue JNI: Call getSurface

BLASTBufferQueue now uses a Surface subclass, and so we need
to call getSurface instead of using the BufferProducer and
constructing a Surface in JNI.

Bug: 168504871
Test: Existing tests pass
Change-Id: Ic11fb96050264310ae967eeadb0ed5de1027c866
2 files changed