detach blur result texture when it is the same texture used to render path mask

R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/26968006

git-svn-id: http://skia.googlecode.com/svn/trunk@11805 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/gmslides.gypi b/gyp/gmslides.gypi
index a69db6a..a83ae2e 100644
--- a/gyp/gmslides.gypi
+++ b/gyp/gmslides.gypi
@@ -115,6 +115,7 @@
     '../gm/shadows.cpp',
     '../gm/shallowgradient.cpp',
     '../gm/simpleaaclip.cpp',
+    '../gm/skbug1719.cpp',
     '../gm/stringart.cpp',
     '../gm/spritebitmap.cpp',
     '../gm/srcmode.cpp',