Doesn't usually matter for well-formed blacklists,

dm/DM.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "CrashHandler.h"
 #include "DMJsonWriter.h"
 #include "DMSrcSink.h"
@@ skipping 335 matching lines @@
         }
     }
 }
 
 static bool match(const char* needle, const char* haystack) {
     return 0 == strcmp("_", needle) || NULL != strstr(haystack, needle);
 }
 
 static ImplicitString is_blacklisted(const char* sink, const char* src,
                                      const char* srcOptions, const char* name) {
-    for (int i = 0; i < FLAGS_blacklist.count() - 2; i += 4) {
+    for (int i = 0; i < FLAGS_blacklist.count() - 3; i += 4) {
         if (match(FLAGS_blacklist[i+0], sink) &&
             match(FLAGS_blacklist[i+1], src) &&
             match(FLAGS_blacklist[i+2], srcOptions) &&
             match(FLAGS_blacklist[i+3], name)) {
             return SkStringPrintf("%s %s %s %s",
                                   FLAGS_blacklist[i+0], FLAGS_blacklist[i+1],
                                   FLAGS_blacklist[i+2], FLAGS_blacklist[i+3]);
         }
     }
     return "";
@@ skipping 311 matching lines @@
     }
     return 0;
 }
 
 #if !defined(SK_BUILD_FOR_IOS)
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return dm_main();
 }
 #endif