[PDF] Speculative fix for chrome crash w/ SRC xfer mode.

BUG=chromium:316546
R=edisonn@google.com, reed@google.com

Author: vandebo@chromium.org

Review URL: https://codereview.chromium.org/61153003

git-svn-id: http://skia.googlecode.com/svn/trunk@12253 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed