[cfi-icall] Blacklist failing cross-DSO call

Add a blacklist entry for a newly failing icall.

Bug: 772906
Change-Id: Ib424f3eb57d2b0184df69cdb34fccdcb0ae788c8
Reviewed-on: https://chromium-review.googlesource.com/759231Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515082}

tools/cfi/blacklist.txt

@@ -181,6 +181,9 @@ fun:*GlobalMenuBarX11*
 # net/cert/cert_verify_proc_nss.cc
 fun:*CertVerifyProcNSS*VerifyInternalImpl*
 
+# third_party/skia/include/gpu/gl/GrGLFunctions.h
+fun:*GrGLFunction*
+
 ######### Function pointers cast to incorrect type signatures
 
 # libicu is currently compiled such that in libicu the 'UChar' type is a