Bug 1062361 - Free cached tiles on memory-pressure. r=nical, a=bajaj
Bug 1061943 - Purge all GradientCache on memory-pressure. r=jrmuizel, a=bajaj
Bug 1055960 - Part 1: fix onpeerlost. r=dimi, a=bajaj
Bug 1055960 - Part 2: Add removeTarget. r=dimi, a=bajaj
Bug 1055960 - Part 3: fix tests cases. r=dimi, a=bajaj