TextureView/GLES20Canvas: Support synchronous GLConsumers
TextureView/GLES20Canvas: Support synchronous GLConsumers

Always update to the newest available frame from a GLConsumer.
Otherwise, with a synchronous queue, rendering can fall behind and
eventually deadlock with producer.

Bug: 10830400
Change-Id: I7f1d752c80ae5dac892a26d82e86806c27f5d955

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base