Add fuzz executable to GN

fuzz/FuzzParsePath.cpp

Index: fuzz/FuzzParsePath.cpp
diff --git a/fuzz/FuzzParsePath.cpp b/fuzz/FuzzParsePath.cpp
index fe1355037d4ac344acf81ca09eb2045f87d68ca5..8e4d8bb78681663d228f2751d5daf97a4c6158c9 100644
--- a/fuzz/FuzzParsePath.cpp
+++ b/fuzz/FuzzParsePath.cpp
@@ -29,13 +29,13 @@ const struct Legal {
     { 'Z', 0 },
 };
 
-bool gEasy = false;  // set to true while debugging to suppress unusual whitespace
+bool _gEasy = false;  // set to true while debugging to suppress unusual whitespace

[mtklein_C, 2016/10/03 17:39:39]

The author of this fuzz probably meant to write

   static bool gEasy = false;

here.  That'll fix the linker error.

He also probably meant that for gLegal (static const struct Legal ...) and
gWhitespace (static const char gWhitespace[] = ...)

That same author probably also meant to make his globals static in
random_parse_path too, but we only need to change one file to make this work. 
:)

[kjlubick, 2016/10/03 18:05:45]

Thanks for the tip.  Done.

 
 // mostly do nothing, then bias towards spaces
 const char gWhiteSpace[] = { 0, 0, 0, 0, 0, 0, 0, 0, ' ', ' ', ' ', ' ', 0x09, 0x0D, 0x0A };
 
 static void add_white(Fuzz* fuzz, SkString* atom) {
-    if (gEasy) {
+    if (_gEasy) {
         atom->append(" ");
         return;
     }
@@ -49,7 +49,7 @@ static void add_white(Fuzz* fuzz, SkString* atom) {
 }
 
 static void add_comma(Fuzz* fuzz, SkString* atom) {
-    if (gEasy) {
+    if (_gEasy) {
         atom->append(",");
         return;
     }
@@ -74,7 +74,7 @@ SkString MakeRandomParsePathPiece(Fuzz* fuzz) {
     SkString atom;
     int index = fuzz->nextRangeU(0, (int) SK_ARRAY_COUNT(gLegal) - 1);
     const Legal& legal = gLegal[index];
-    gEasy ? atom.append("\n") : add_white(fuzz, &atom);
+    _gEasy ? atom.append("\n") : add_white(fuzz, &atom);
     char symbol = legal.fSymbol | (fuzz->nextBool() ? 0x20 : 0);
     atom.append(&symbol, 1);
     int reps = fuzz->nextRangeU(1, 3);