Fixes a tile scaling bug that resulted in low level tiles creating a peculiar mosaic on intensive zooming to non-predownloaded areas. (YAY!)
Fixes a tile scaling bug that resulted in low level tiles creating a
peculiar mosaic on intensive zooming to non-predownloaded areas.
(YAY!)

REVIEW: 123306
(cherry picked from commit 7c4dcf9e0b384301df29fc062ef29c031eae45d3)

probonopd/marble,probonopd/marble,probonopd/marble,probonopd/marble,probonopd/marble,probonopd/marble,probonopd/marble