Add code to collect data for tx size selection
Add code to collect data for tx size selection

Use macro COLLECT_TX_SIZE_DATA to turn it on/off.

Change-Id: If5240872815a8afb526cf8b439963ed00c82b447

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom