Add GrSet class built on top of RedBlackTree

src/gpu/GrRedBlackTree.h

Index: src/gpu/GrRedBlackTree.h
diff --git a/src/gpu/GrRedBlackTree.h b/src/gpu/GrRedBlackTree.h
index db36e32d0473b1ebbb7444845bc5af2580f39eb2..8cb04bb14d13ee24d7ed775304794ee039b54b96 100644
--- a/src/gpu/GrRedBlackTree.h
+++ b/src/gpu/GrRedBlackTree.h
@@ -11,6 +11,8 @@
 #include "GrConfig.h"
 #include "SkTypes.h"
 
+#include <cstring>

[bsalomon, 2014/02/26 21:56:09]

I notice in other places we #include string.h and use strcmp rather than
std::strcmp. Maybe that's not the best practice, but we should probably at least
be consistent.

+
 template <typename T>
 class GrLess {
 public:
@@ -23,6 +25,11 @@ public:
     bool operator()(const T* a, const T* b) const { return *a < *b; }
 };
 
+class GrStrLess {
+public:
+    bool operator()(const char* a, const char* b) const { return std::strcmp(a,b) < 0; }
+};
+
 /**
  * In debug build this will cause full traversals of the tree when the validate
  * is called on insert and remove. Useful for debugging but very slow.