Fixed mask positioning and texture UVs bugs in
the software compositor.

Layout tests that pass with this patch:

  platform/chromium/virtual/softwarecompositing/masks/layer-mask-placement.html
  platform/chromium/virtual/softwarecompositing/masks/mask-of-clipped-layer.html


BUG=124671

Review URL: https://chromiumcodereview.appspot.com/11313017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@164950 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed