path ops -- handle non-finite numbers

Op() and Simplify() do nothing if the input
is non-finite. Add code and tests.
Review URL: https://codereview.chromium.org/14407006

git-svn-id: http://skia.googlecode.com/svn/trunk@8882 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/pathops_unittest.gypi b/gyp/pathops_unittest.gypi
index 21fb929..271edbf 100644
--- a/gyp/pathops_unittest.gypi
+++ b/gyp/pathops_unittest.gypi
@@ -28,6 +28,7 @@
     '../tests/PathOpsQuadParameterizationTest.cpp',
     '../tests/PathOpsQuadReduceOrderTest.cpp',
     '../tests/PathOpsSimplifyDegenerateThreadedTest.cpp',
+    '../tests/PathOpsSimplifyFailTest.cpp',
     '../tests/PathOpsSimplifyQuadralateralsThreadedTest.cpp',
     '../tests/PathOpsSimplifyQuadThreadedTest.cpp',
     '../tests/PathOpsSimplifyRectThreadedTest.cpp',