Fuse GrReplacements and GrLayerCache

src/core/SkLayerInfo.h

Index: src/core/SkLayerInfo.h
diff --git a/src/core/SkLayerInfo.h b/src/core/SkLayerInfo.h
index 6ed77c993c117769a739c3e29acd9d8459d46a0b..add57d780c6ea0bed6478c6543a3b22bb0c6fcd0 100644
--- a/src/core/SkLayerInfo.h
+++ b/src/core/SkLayerInfo.h
@@ -53,7 +53,7 @@ public:
         // The variable length key for this saveLayer block. It stores the
         // thread of drawPicture and saveLayer operation indices that lead to this
         // saveLayer (including its own op index). The BlockInfo owns this memory.
-        int*    fKey;
+        unsigned* fKey;
         int     fKeySize;  // # of ints
     };