Guard tiles by synchronized block.

Tiles might be touched in different threads.

bug:7490351
Change-Id: Ie30d43db90cf63f7a6ec6438faabfcae8bca151a
1 file changed
tree: 720f09a0b0324ba1da8a8d85e41d54b0f32e7c39
  1. gallerycommon/
  2. src/
  3. src_pd/
  4. tests/