Fix saveLayer() clipping w/filters, GPU path.

Don't modify the clipstack in saveLayer() if the kClipToLayer_SaveFlag is
not set. Without this the GPU path will clip the offscreen to the layer's
bounds, even if the flag is not set.

R=robertphillips@google.com
BUG=skia:

Review URL: https://codereview.chromium.org/164203002

git-svn-id: http://skia.googlecode.com/svn/trunk@13561 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed