Temporarily add SK_CROP_RECT_IS_INT flag to blink_skia_config.gyp. This is part of a 2-sided change to the SkImageFilter API.

BUG=

Review URL: https://codereview.chromium.org/26896002

git-svn-id: svn://svn.chromium.org/blink/trunk@159379 bbb929c8-8fbe-4397-9dbb-9b2b20218538